diff --git a/packages/grpc-js/src/channel-credentials.ts b/packages/grpc-js/src/channel-credentials.ts
index f42c7e93..5d5b87d5 100644
--- a/packages/grpc-js/src/channel-credentials.ts
+++ b/packages/grpc-js/src/channel-credentials.ts
@@ -18,7 +18,7 @@
 import { ConnectionOptions, createSecureContext, PeerCertificate } from 'tls';
 
 import { CallCredentials } from './call-credentials';
-import {CIPHER_SUITES, getDefaultRootsData} from './tls-helpers';
+import { CIPHER_SUITES, getDefaultRootsData } from './tls-helpers';
 
 // tslint:disable-next-line:no-any
 function verifyIsBufferOrNull(obj: any, friendlyName: string): void {
@@ -190,7 +190,7 @@ class SecureChannelCredentialsImpl extends ChannelCredentials {
       ca: rootCerts || undefined,
       key: privateKey || undefined,
       cert: certChain || undefined,
-      ciphers: CIPHER_SUITES
+      ciphers: CIPHER_SUITES,
     });
     this.connectionOptions = { secureContext };
     if (verifyOptions && verifyOptions.checkServerIdentity) {
diff --git a/packages/grpc-js/src/channel.ts b/packages/grpc-js/src/channel.ts
index 6cf987cb..d43da0e5 100644
--- a/packages/grpc-js/src/channel.ts
+++ b/packages/grpc-js/src/channel.ts
@@ -38,6 +38,7 @@ import { getDefaultAuthority } from './resolver';
 import { LoadBalancingConfig } from './load-balancing-config';
 import { ServiceConfig, validateServiceConfig } from './service-config';
 import { trace } from './logging';
+import { SubchannelAddress } from './subchannel';
 
 export enum ConnectivityState {
   CONNECTING,
@@ -142,10 +143,12 @@ export class ChannelImplementation implements Channel {
   ) {
     /* The global boolean parameter to getSubchannelPool has the inverse meaning to what
      * the grpc.use_local_subchannel_pool channel option means. */
-    this.subchannelPool = getSubchannelPool((options['grpc.use_local_subchannel_pool'] ?? 0) === 0);
+    this.subchannelPool = getSubchannelPool(
+      (options['grpc.use_local_subchannel_pool'] ?? 0) === 0
+    );
     const channelControlHelper: ChannelControlHelper = {
       createSubchannel: (
-        subchannelAddress: string,
+        subchannelAddress: SubchannelAddress,
         subchannelArgs: ChannelOptions
       ) => {
         return this.subchannelPool.getOrCreateSubchannel(
diff --git a/packages/grpc-js/src/load-balancer-pick-first.ts b/packages/grpc-js/src/load-balancer-pick-first.ts
index a5fbf0fa..52ce8457 100644
--- a/packages/grpc-js/src/load-balancer-pick-first.ts
+++ b/packages/grpc-js/src/load-balancer-pick-first.ts
@@ -30,7 +30,11 @@ import {
   UnavailablePicker,
 } from './picker';
 import { LoadBalancingConfig } from './load-balancing-config';
-import { Subchannel, ConnectivityStateListener } from './subchannel';
+import {
+  Subchannel,
+  ConnectivityStateListener,
+  SubchannelAddress,
+} from './subchannel';
 import * as logging from './logging';
 import { LogVerbosity } from './constants';
 
@@ -76,7 +80,7 @@ export class PickFirstLoadBalancer implements LoadBalancer {
   /**
    * The list of backend addresses most recently passed to `updateAddressList`.
    */
-  private latestAddressList: string[] = [];
+  private latestAddressList: SubchannelAddress[] = [];
   /**
    * The list of subchannels this load balancer is currently attempting to
    * connect to.
@@ -369,7 +373,7 @@ export class PickFirstLoadBalancer implements LoadBalancer {
   }
 
   updateAddressList(
-    addressList: string[],
+    addressList: SubchannelAddress[],
     lbConfig: LoadBalancingConfig | null
   ): void {
     // lbConfig has no useful information for pick first load balancing
diff --git a/packages/grpc-js/src/load-balancer-round-robin.ts b/packages/grpc-js/src/load-balancer-round-robin.ts
index e3eedfe5..4956e11e 100644
--- a/packages/grpc-js/src/load-balancer-round-robin.ts
+++ b/packages/grpc-js/src/load-balancer-round-robin.ts
@@ -30,7 +30,11 @@ import {
   UnavailablePicker,
 } from './picker';
 import { LoadBalancingConfig } from './load-balancing-config';
-import { Subchannel, ConnectivityStateListener } from './subchannel';
+import {
+  Subchannel,
+  ConnectivityStateListener,
+  SubchannelAddress,
+} from './subchannel';
 
 const TYPE_NAME = 'round_robin';
 
@@ -168,7 +172,7 @@ export class RoundRobinLoadBalancer implements LoadBalancer {
   }
 
   updateAddressList(
-    addressList: string[],
+    addressList: SubchannelAddress[],
     lbConfig: LoadBalancingConfig | null
   ): void {
     this.resetSubchannelList();
diff --git a/packages/grpc-js/src/load-balancer.ts b/packages/grpc-js/src/load-balancer.ts
index 69114521..5fa4bdc5 100644
--- a/packages/grpc-js/src/load-balancer.ts
+++ b/packages/grpc-js/src/load-balancer.ts
@@ -16,7 +16,7 @@
  */
 
 import { ChannelOptions } from './channel-options';
-import { Subchannel } from './subchannel';
+import { Subchannel, SubchannelAddress } from './subchannel';
 import { ConnectivityState } from './channel';
 import { Picker } from './picker';
 import { LoadBalancingConfig } from './load-balancing-config';
@@ -34,7 +34,7 @@ export interface ChannelControlHelper {
    * @param subchannelArgs Extra channel arguments specified by the load balancer
    */
   createSubchannel(
-    subchannelAddress: string,
+    subchannelAddress: SubchannelAddress,
     subchannelArgs: ChannelOptions
   ): Subchannel;
   /**
@@ -66,7 +66,7 @@ export interface LoadBalancer {
    *     if one was provided
    */
   updateAddressList(
-    addressList: string[],
+    addressList: SubchannelAddress[],
     lbConfig: LoadBalancingConfig | null
   ): void;
   /**
diff --git a/packages/grpc-js/src/resolver-dns.ts b/packages/grpc-js/src/resolver-dns.ts
index 9f91d70a..6885f351 100644
--- a/packages/grpc-js/src/resolver-dns.ts
+++ b/packages/grpc-js/src/resolver-dns.ts
@@ -30,6 +30,7 @@ import { StatusObject } from './call-stream';
 import { Metadata } from './metadata';
 import * as logging from './logging';
 import { LogVerbosity } from './constants';
+import { SubchannelAddress, TcpSubchannelAddress } from './subchannel';
 
 const TRACER_NAME = 'dns_resolver';
 
@@ -112,7 +113,7 @@ const dnsLookupPromise = util.promisify(dns.lookup);
  * @param target
  * @return An "IP:port" string in an array if parsing was successful, `null` otherwise
  */
-function parseIP(target: string): string[] | null {
+function parseIP(target: string): SubchannelAddress[] | null {
   /* These three regular expressions are all mutually exclusive, so we just
    * want the first one that matches the target string, if any do. */
   const ipv4Match = IPV4_REGEX.exec(target);
@@ -123,14 +124,14 @@ function parseIP(target: string): string[] | null {
   }
 
   // ipv6 addresses should be bracketed
-  const addr = ipv4Match ? match[1] : `[${match[1]}]`;
+  const addr = match[1];
   let port: string;
   if (match[2]) {
     port = match[2];
   } else {
     port = DEFAULT_PORT;
   }
-  return [`${addr}:${port}`];
+  return [{ host: addr, port: +port }];
 }
 
 /**
@@ -161,7 +162,7 @@ function mergeArrays<T>(...arrays: T[][]): T[] {
  * Resolver implementation that handles DNS names and IP addresses.
  */
 class DnsResolver implements Resolver {
-  private readonly ipResult: string[] | null;
+  private readonly ipResult: SubchannelAddress[] | null;
   private readonly dnsHostname: string | null;
   private readonly port: string | null;
   /* The promise results here contain, in order, the A record, the AAAA record,
@@ -222,23 +223,28 @@ class DnsResolver implements Resolver {
       this.pendingResultPromise.then(
         ([addressList, txtRecord]) => {
           this.pendingResultPromise = null;
-          const ip4Addresses: string[] = addressList
-            .filter(addr => addr.family === 4)
-            .map(addr => `${addr.address}:${this.port}`);
-          let ip6Addresses: string[];
+          const ip4Addresses: dns.LookupAddress[] = addressList.filter(
+            addr => addr.family === 4
+          );
+          let ip6Addresses: dns.LookupAddress[];
           if (semver.satisfies(process.version, IPV6_SUPPORT_RANGE)) {
-            ip6Addresses = addressList
-              .filter(addr => addr.family === 6)
-              .map(addr => `[${addr.address}]:${this.port}`);
+            ip6Addresses = addressList.filter(addr => addr.family === 6);
           } else {
             ip6Addresses = [];
           }
-          const allAddresses: string[] = mergeArrays(
+          const allAddresses: TcpSubchannelAddress[] = mergeArrays(
             ip4Addresses,
             ip6Addresses
-          );
+          ).map(addr => ({ host: addr.address, port: +this.port! }));
+          const allAddressesString: string =
+            '[' +
+            allAddresses.map(addr => addr.host + ':' + addr.port).join(',') +
+            ']';
           trace(
-            'Resolved addresses for target ' + this.target + ': ' + allAddresses
+            'Resolved addresses for target ' +
+              this.target +
+              ': ' +
+              allAddressesString
           );
           if (allAddresses.length === 0) {
             this.listener.onError(this.defaultResolutionError);
diff --git a/packages/grpc-js/src/resolver-uds.ts b/packages/grpc-js/src/resolver-uds.ts
index 536a018b..91128d2c 100644
--- a/packages/grpc-js/src/resolver-uds.ts
+++ b/packages/grpc-js/src/resolver-uds.ts
@@ -20,6 +20,7 @@ import {
   registerResolver,
   registerDefaultResolver,
 } from './resolver';
+import { SubchannelAddress } from './subchannel';
 
 function getUdsName(target: string): string {
   /* Due to how this resolver is registered, it should only be constructed
@@ -34,9 +35,9 @@ function getUdsName(target: string): string {
 }
 
 class UdsResolver implements Resolver {
-  private addresses: string[] = [];
+  private addresses: SubchannelAddress[] = [];
   constructor(target: string, private listener: ResolverListener) {
-    this.addresses = [getUdsName(target)];
+    this.addresses = [{ path: getUdsName(target) }];
   }
   updateResolution(): void {
     process.nextTick(
diff --git a/packages/grpc-js/src/resolver.ts b/packages/grpc-js/src/resolver.ts
index 3af5da9c..b2be310f 100644
--- a/packages/grpc-js/src/resolver.ts
+++ b/packages/grpc-js/src/resolver.ts
@@ -20,6 +20,7 @@ import { ServiceConfig } from './service-config';
 import * as resolver_dns from './resolver-dns';
 import * as resolver_uds from './resolver-uds';
 import { StatusObject } from './call-stream';
+import { SubchannelAddress } from './subchannel';
 
 /**
  * A listener object passed to the resolver's constructor that provides name
@@ -36,7 +37,7 @@ export interface ResolverListener {
    *     service configuration was invalid
    */
   onSuccessfulResolution(
-    addressList: string[],
+    addressList: SubchannelAddress[],
     serviceConfig: ServiceConfig | null,
     serviceConfigError: StatusObject | null
   ): void;
diff --git a/packages/grpc-js/src/resolving-load-balancer.ts b/packages/grpc-js/src/resolving-load-balancer.ts
index 496e1345..a9ba0594 100644
--- a/packages/grpc-js/src/resolving-load-balancer.ts
+++ b/packages/grpc-js/src/resolving-load-balancer.ts
@@ -34,6 +34,7 @@ import { StatusObject } from './call-stream';
 import { Metadata } from './metadata';
 import * as logging from './logging';
 import { LogVerbosity } from './constants';
+import { SubchannelAddress } from './subchannel';
 
 const TRACER_NAME = 'resolving_load_balancer';
 
@@ -132,7 +133,7 @@ export class ResolvingLoadBalancer implements LoadBalancer {
     this.updateState(ConnectivityState.IDLE, new QueuePicker(this));
     this.innerResolver = createResolver(target, {
       onSuccessfulResolution: (
-        addressList: string[],
+        addressList: SubchannelAddress[],
         serviceConfig: ServiceConfig | null,
         serviceConfigError: ServiceError | null
       ) => {
@@ -243,7 +244,7 @@ export class ResolvingLoadBalancer implements LoadBalancer {
 
     this.innerChannelControlHelper = {
       createSubchannel: (
-        subchannelAddress: string,
+        subchannelAddress: SubchannelAddress,
         subchannelArgs: ChannelOptions
       ) => {
         return this.channelControlHelper.createSubchannel(
@@ -289,7 +290,7 @@ export class ResolvingLoadBalancer implements LoadBalancer {
 
     this.replacementChannelControlHelper = {
       createSubchannel: (
-        subchannelAddress: string,
+        subchannelAddress: SubchannelAddress,
         subchannelArgs: ChannelOptions
       ) => {
         return this.channelControlHelper.createSubchannel(
@@ -409,7 +410,7 @@ export class ResolvingLoadBalancer implements LoadBalancer {
   }
 
   updateAddressList(
-    addressList: string[],
+    addressList: SubchannelAddress[],
     lbConfig: LoadBalancingConfig | null
   ) {
     throw new Error('updateAddressList not supported on ResolvingLoadBalancer');
diff --git a/packages/grpc-js/src/server-credentials.ts b/packages/grpc-js/src/server-credentials.ts
index b56cb68a..17ab2980 100644
--- a/packages/grpc-js/src/server-credentials.ts
+++ b/packages/grpc-js/src/server-credentials.ts
@@ -16,7 +16,7 @@
  */
 
 import { SecureServerOptions } from 'http2';
-import {CIPHER_SUITES, getDefaultRootsData} from './tls-helpers';
+import { CIPHER_SUITES, getDefaultRootsData } from './tls-helpers';
 
 export interface KeyCertPair {
   private_key: Buffer;
@@ -75,7 +75,7 @@ export abstract class ServerCredentials {
       cert,
       key,
       requestCert: checkClientCertificate,
-      ciphers: CIPHER_SUITES
+      ciphers: CIPHER_SUITES,
     });
   }
 }
diff --git a/packages/grpc-js/src/server.ts b/packages/grpc-js/src/server.ts
index 03fcfaf9..a2db30be 100644
--- a/packages/grpc-js/src/server.ts
+++ b/packages/grpc-js/src/server.ts
@@ -203,11 +203,16 @@ export class Server {
     const options: ListenOptions = { host: url.hostname, port: +url.port };
     const serverOptions: http2.ServerOptions = {};
     if ('grpc.max_concurrent_streams' in this.options) {
-      serverOptions.settings = {maxConcurrentStreams: this.options['grpc.max_concurrent_streams']};
+      serverOptions.settings = {
+        maxConcurrentStreams: this.options['grpc.max_concurrent_streams'],
+      };
     }
 
     if (creds._isSecure()) {
-      const secureServerOptions = Object.assign(serverOptions, creds._getSettings()!);
+      const secureServerOptions = Object.assign(
+        serverOptions,
+        creds._getSettings()!
+      );
       this.http2Server = http2.createSecureServer(secureServerOptions);
     } else {
       this.http2Server = http2.createServer(serverOptions);
diff --git a/packages/grpc-js/src/subchannel-pool.ts b/packages/grpc-js/src/subchannel-pool.ts
index 009141e3..61a4e13c 100644
--- a/packages/grpc-js/src/subchannel-pool.ts
+++ b/packages/grpc-js/src/subchannel-pool.ts
@@ -16,7 +16,11 @@
  */
 
 import { ChannelOptions, channelOptionsEqual } from './channel-options';
-import { Subchannel } from './subchannel';
+import {
+  Subchannel,
+  SubchannelAddress,
+  subchannelAddressEqual,
+} from './subchannel';
 import { ChannelCredentials } from './channel-credentials';
 
 // 10 seconds in milliseconds. This value is arbitrary.
@@ -28,13 +32,12 @@ const REF_CHECK_INTERVAL = 10_000;
 
 export class SubchannelPool {
   private pool: {
-    [channelTarget: string]: {
-      [subchannelTarget: string]: Array<{
-        channelArguments: ChannelOptions;
-        channelCredentials: ChannelCredentials;
-        subchannel: Subchannel;
-      }>;
-    };
+    [channelTarget: string]: Array<{
+      subchannelAddress: SubchannelAddress;
+      channelArguments: ChannelOptions;
+      channelCredentials: ChannelCredentials;
+      subchannel: Subchannel;
+    }>;
   } = Object.create(null);
 
   /**
@@ -62,23 +65,20 @@ export class SubchannelPool {
      * do not need to be filtered */
     // tslint:disable-next-line:forin
     for (const channelTarget in this.pool) {
-      // tslint:disable-next-line:forin
-      for (const subchannelTarget in this.pool[channelTarget]) {
-        const subchannelObjArray = this.pool[channelTarget][subchannelTarget];
+      const subchannelObjArray = this.pool[channelTarget];
 
-        const refedSubchannels = subchannelObjArray.filter(
-          value => !value.subchannel.unrefIfOneRef()
-        );
+      const refedSubchannels = subchannelObjArray.filter(
+        value => !value.subchannel.unrefIfOneRef()
+      );
 
-        if (refedSubchannels.length > 0) {
-          allSubchannelsUnrefed = false;
-        }
-
-        /* For each subchannel in the pool, try to unref it if it has
-         * exactly one ref (which is the ref from the pool itself). If that
-         * does happen, remove the subchannel from the pool */
-        this.pool[channelTarget][subchannelTarget] = refedSubchannels;
+      if (refedSubchannels.length > 0) {
+        allSubchannelsUnrefed = false;
       }
+
+      /* For each subchannel in the pool, try to unref it if it has
+       * exactly one ref (which is the ref from the pool itself). If that
+       * does happen, remove the subchannel from the pool */
+      this.pool[channelTarget] = refedSubchannels;
     }
     /* Currently we do not delete keys with empty values. If that results
      * in significant memory usage we should change it. */
@@ -114,25 +114,27 @@ export class SubchannelPool {
    */
   getOrCreateSubchannel(
     channelTarget: string,
-    subchannelTarget: string,
+    subchannelTarget: SubchannelAddress,
     channelArguments: ChannelOptions,
     channelCredentials: ChannelCredentials
   ): Subchannel {
     this.ensureCleanupTask();
 
     if (channelTarget in this.pool) {
-      if (subchannelTarget in this.pool[channelTarget]) {
-        const subchannelObjArray = this.pool[channelTarget][subchannelTarget];
-        for (const subchannelObj of subchannelObjArray) {
-          if (
-            channelOptionsEqual(
-              channelArguments,
-              subchannelObj.channelArguments
-            ) &&
-            channelCredentials._equals(subchannelObj.channelCredentials)
-          ) {
-            return subchannelObj.subchannel;
-          }
+      const subchannelObjArray = this.pool[channelTarget];
+      for (const subchannelObj of subchannelObjArray) {
+        if (
+          subchannelAddressEqual(
+            subchannelTarget,
+            subchannelObj.subchannelAddress
+          ) &&
+          channelOptionsEqual(
+            channelArguments,
+            subchannelObj.channelArguments
+          ) &&
+          channelCredentials._equals(subchannelObj.channelCredentials)
+        ) {
+          return subchannelObj.subchannel;
         }
       }
     }
@@ -144,12 +146,10 @@ export class SubchannelPool {
       channelCredentials
     );
     if (!(channelTarget in this.pool)) {
-      this.pool[channelTarget] = Object.create(null);
+      this.pool[channelTarget] = [];
     }
-    if (!(subchannelTarget in this.pool[channelTarget])) {
-      this.pool[channelTarget][subchannelTarget] = [];
-    }
-    this.pool[channelTarget][subchannelTarget].push({
+    this.pool[channelTarget].push({
+      subchannelAddress: subchannelTarget,
       channelArguments,
       channelCredentials,
       subchannel,
diff --git a/packages/grpc-js/src/subchannel.ts b/packages/grpc-js/src/subchannel.ts
index b6b282d5..bb64bd93 100644
--- a/packages/grpc-js/src/subchannel.ts
+++ b/packages/grpc-js/src/subchannel.ts
@@ -20,12 +20,13 @@ import { ChannelCredentials } from './channel-credentials';
 import { Metadata } from './metadata';
 import { Http2CallStream } from './call-stream';
 import { ChannelOptions } from './channel-options';
-import { PeerCertificate, checkServerIdentity } from 'tls';
+import { PeerCertificate, checkServerIdentity, TLSSocket } from 'tls';
 import { ConnectivityState } from './channel';
 import { BackoffTimeout, BackoffOptions } from './backoff-timeout';
 import { getDefaultAuthority } from './resolver';
 import * as logging from './logging';
 import { LogVerbosity } from './constants';
+import * as net from 'net';
 
 const { version: clientVersion } = require('../../package.json');
 
@@ -73,6 +74,44 @@ function uniformRandom(min: number, max: number) {
 
 const tooManyPingsData: Buffer = Buffer.from('too_many_pings', 'ascii');
 
+export interface TcpSubchannelAddress {
+  port: number;
+  host: string;
+}
+
+export interface IpcSubchannelAddress {
+  path: string;
+}
+
+/**
+ * This represents a single backend address to connect to. This interface is a
+ * subset of net.SocketConnectOpts, i.e. the options described at
+ * https://nodejs.org/api/net.html#net_socket_connect_options_connectlistener.
+ * Those are in turn a subset of the options that can be passed to http2.connect.
+ */
+export type SubchannelAddress = TcpSubchannelAddress | IpcSubchannelAddress;
+
+export function isTcpSubchannelAddress(
+  address: SubchannelAddress
+): address is TcpSubchannelAddress {
+  return 'port' in address;
+}
+
+export function subchannelAddressEqual(
+  address1: SubchannelAddress,
+  address2: SubchannelAddress
+): boolean {
+  if (isTcpSubchannelAddress(address1)) {
+    return (
+      isTcpSubchannelAddress(address2) &&
+      address1.host === address2.host &&
+      address1.port === address2.port
+    );
+  } else {
+    return !isTcpSubchannelAddress(address2) && address1.path === address2.path;
+  }
+}
+
 export class Subchannel {
   /**
    * The subchannel's current connectivity state. Invariant: `session` === `null`
@@ -135,6 +174,11 @@ export class Subchannel {
    */
   private refcount = 0;
 
+  /**
+   * A string representation of the subchannel address, for logging/tracing
+   */
+  private subchannelAddressString: string;
+
   /**
    * A class representing a connection to a single backend.
    * @param channelTarget The target string for the channel as a whole
@@ -147,7 +191,7 @@ export class Subchannel {
    */
   constructor(
     private channelTarget: string,
-    private subchannelAddress: string,
+    private subchannelAddress: SubchannelAddress,
     private options: ChannelOptions,
     private credentials: ChannelCredentials
   ) {
@@ -172,7 +216,7 @@ export class Subchannel {
     clearTimeout(this.keepaliveTimeoutId);
     const backoffOptions: BackoffOptions = {
       initialDelay: options['grpc.initial_reconnect_backoff_ms'],
-      maxDelay: options['grpc.max_reconnect_backoff_ms']
+      maxDelay: options['grpc.max_reconnect_backoff_ms'],
     };
     this.backoffTimeout = new BackoffTimeout(() => {
       if (this.continueConnecting) {
@@ -187,6 +231,11 @@ export class Subchannel {
         );
       }
     }, backoffOptions);
+    if (isTcpSubchannelAddress(subchannelAddress)) {
+      this.subchannelAddressString = `${subchannelAddress.host}:${subchannelAddress.port}`;
+    } else {
+      this.subchannelAddressString = `${subchannelAddress.path}`;
+    }
   }
 
   /**
@@ -225,7 +274,7 @@ export class Subchannel {
   }
 
   private startConnectingInternal() {
-    const connectionOptions: http2.SecureClientSessionOptions =
+    let connectionOptions: http2.SecureClientSessionOptions =
       this.credentials._getConnectionOptions() || {};
     let addressScheme = 'http://';
     if ('secureContext' in connectionOptions) {
@@ -247,9 +296,40 @@ export class Subchannel {
       } else {
         connectionOptions.servername = getDefaultAuthority(this.channelTarget);
       }
+    } else {
+      /* In all but the most recent versions of Node, http2.connect does not use
+       * the options when establishing plaintext connections, so we need to
+       * establish that connection explicitly. */
+      connectionOptions.createConnection = (authority, option) => {
+        /* net.NetConnectOpts is declared in a way that is more restrictive
+         * than what net.connect will actually accept, so we use the type
+         * assertion to work around that. */
+        return net.connect(this.subchannelAddress as net.NetConnectOpts);
+      };
     }
+    connectionOptions = Object.assign(
+      connectionOptions,
+      this.subchannelAddress
+    );
+    /* http2.connect uses the options here:
+     * https://github.com/nodejs/node/blob/70c32a6d190e2b5d7b9ff9d5b6a459d14e8b7d59/lib/internal/http2/core.js#L3028-L3036
+     * The spread operator overides earlier values with later ones, so any port
+     * or host values in the options will be used rather than any values extracted
+     * from the first argument. In addition, the path overrides the host and port,
+     * as documented for plaintext connections here:
+     * https://nodejs.org/api/net.html#net_socket_connect_options_connectlistener
+     * and for TLS connections here:
+     * https://nodejs.org/api/tls.html#tls_tls_connect_options_callback. In
+     * earlier versions of Node, http2.connect passes these options to
+     * tls.connect but not net.connect, so in the insecure case we still need
+     * to set the createConnection option above to create the connection
+     * explicitly. We cannot do that in the TLS case because http2.connect
+     * passes necessary additional options to tls.connect.
+     * The first argument just needs to be parseable as a URL and the scheme
+     * determines whether the connection will be established over TLS or not.
+     */
     const session = http2.connect(
-      addressScheme + this.subchannelAddress,
+      addressScheme + getDefaultAuthority(this.channelTarget),
       connectionOptions
     );
     this.session = session;
@@ -328,7 +408,7 @@ export class Subchannel {
       return false;
     }
     trace(
-      this.subchannelAddress +
+      this.subchannelAddressString +
         ' ' +
         ConnectivityState[this.connectivityState] +
         ' -> ' +
@@ -400,7 +480,7 @@ export class Subchannel {
 
   callRef() {
     trace(
-      this.subchannelAddress +
+      this.subchannelAddressString +
         ' callRefcount ' +
         this.callRefcount +
         ' -> ' +
@@ -417,7 +497,7 @@ export class Subchannel {
 
   callUnref() {
     trace(
-      this.subchannelAddress +
+      this.subchannelAddressString +
         ' callRefcount ' +
         this.callRefcount +
         ' -> ' +
@@ -435,7 +515,7 @@ export class Subchannel {
 
   ref() {
     trace(
-      this.subchannelAddress +
+      this.subchannelAddressString +
         ' callRefcount ' +
         this.refcount +
         ' -> ' +
@@ -446,7 +526,7 @@ export class Subchannel {
 
   unref() {
     trace(
-      this.subchannelAddress +
+      this.subchannelAddressString +
         ' callRefcount ' +
         this.refcount +
         ' -> ' +
@@ -557,6 +637,6 @@ export class Subchannel {
   }
 
   getAddress(): string {
-    return this.subchannelAddress;
+    return this.subchannelAddressString;
   }
 }
diff --git a/packages/grpc-js/src/tls-helpers.ts b/packages/grpc-js/src/tls-helpers.ts
index 161666ed..3f7a62e7 100644
--- a/packages/grpc-js/src/tls-helpers.ts
+++ b/packages/grpc-js/src/tls-helpers.ts
@@ -17,7 +17,8 @@
 
 import * as fs from 'fs';
 
-export const CIPHER_SUITES: string | undefined = process.env.GRPC_SSL_CIPHER_SUITES;
+export const CIPHER_SUITES: string | undefined =
+  process.env.GRPC_SSL_CIPHER_SUITES;
 
 const DEFAULT_ROOTS_FILE_PATH = process.env.GRPC_DEFAULT_SSL_ROOTS_FILE_PATH;
 
@@ -31,4 +32,4 @@ export function getDefaultRootsData(): Buffer | null {
     return defaultRootsData;
   }
   return null;
-}
\ No newline at end of file
+}
diff --git a/packages/grpc-js/test/test-resolver.ts b/packages/grpc-js/test/test-resolver.ts
index 951291a6..ebb4d567 100644
--- a/packages/grpc-js/test/test-resolver.ts
+++ b/packages/grpc-js/test/test-resolver.ts
@@ -21,6 +21,7 @@ import * as assert from 'assert';
 import * as resolverManager from '../src/resolver';
 import { ServiceConfig } from '../src/service-config';
 import { StatusObject } from '../src/call-stream';
+import { SubchannelAddress, isTcpSubchannelAddress } from '../src/subchannel';
 
 describe('Name Resolver', () => {
   describe('DNS Names', function() {
@@ -33,11 +34,18 @@ describe('Name Resolver', () => {
       const target = 'localhost:50051';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
-          assert(addressList.includes('127.0.0.1:50051'));
+          assert(
+            addressList.some(
+              addr =>
+                isTcpSubchannelAddress(addr) &&
+                addr.host === '127.0.0.1' &&
+                addr.port === 50051
+            )
+          );
           // We would check for the IPv6 address but it needs to be omitted on some Node versions
           done();
         },
@@ -52,11 +60,18 @@ describe('Name Resolver', () => {
       const target = 'localhost';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
-          assert(addressList.includes('127.0.0.1:443'));
+          assert(
+            addressList.some(
+              addr =>
+                isTcpSubchannelAddress(addr) &&
+                addr.host === '127.0.0.1' &&
+                addr.port === 443
+            )
+          );
           // We would check for the IPv6 address but it needs to be omitted on some Node versions
           done();
         },
@@ -71,11 +86,18 @@ describe('Name Resolver', () => {
       const target = '1.2.3.4';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
-          assert(addressList.includes('1.2.3.4:443'));
+          assert(
+            addressList.some(
+              addr =>
+                isTcpSubchannelAddress(addr) &&
+                addr.host === '1.2.3.4' &&
+                addr.port === 443
+            )
+          );
           // We would check for the IPv6 address but it needs to be omitted on some Node versions
           done();
         },
@@ -90,11 +112,18 @@ describe('Name Resolver', () => {
       const target = '::1';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
-          assert(addressList.includes('[::1]:443'));
+          assert(
+            addressList.some(
+              addr =>
+                isTcpSubchannelAddress(addr) &&
+                addr.host === '::1' &&
+                addr.port === 443
+            )
+          );
           // We would check for the IPv6 address but it needs to be omitted on some Node versions
           done();
         },
@@ -109,11 +138,18 @@ describe('Name Resolver', () => {
       const target = '[::1]:50051';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
-          assert(addressList.includes('[::1]:50051'));
+          assert(
+            addressList.some(
+              addr =>
+                isTcpSubchannelAddress(addr) &&
+                addr.host === '::1' &&
+                addr.port === 50051
+            )
+          );
           // We would check for the IPv6 address but it needs to be omitted on some Node versions
           done();
         },
@@ -128,7 +164,7 @@ describe('Name Resolver', () => {
       const target = 'example.com';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
@@ -146,7 +182,7 @@ describe('Name Resolver', () => {
       const target = 'loopback4.unittest.grpc.io';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
@@ -166,7 +202,7 @@ describe('Name Resolver', () => {
       const target = 'network-tools.com';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
@@ -196,7 +232,7 @@ describe('Name Resolver', () => {
       const target2 = 'grpc-test4.sandbox.googleapis.com';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
@@ -218,11 +254,15 @@ describe('Name Resolver', () => {
       const target = 'unix:socket';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
-          assert(addressList.includes('socket'));
+          assert(
+            addressList.some(
+              addr => !isTcpSubchannelAddress(addr) && addr.path === 'socket'
+            )
+          );
           done();
         },
         onError: (error: StatusObject) => {
@@ -236,11 +276,16 @@ describe('Name Resolver', () => {
       const target = 'unix:///tmp/socket';
       const listener: resolverManager.ResolverListener = {
         onSuccessfulResolution: (
-          addressList: string[],
+          addressList: SubchannelAddress[],
           serviceConfig: ServiceConfig | null,
           serviceConfigError: StatusObject | null
         ) => {
-          assert(addressList.includes('/tmp/socket'));
+          assert(
+            addressList.some(
+              addr =>
+                !isTcpSubchannelAddress(addr) && addr.path === '/tmp/socket'
+            )
+          );
           done();
         },
         onError: (error: StatusObject) => {