diff --git a/packages/@aws-cdk/aws-servicediscovery/lib/service.ts b/packages/@aws-cdk/aws-servicediscovery/lib/service.ts
index 12d9ac01be3ad..d5bbbf048078c 100644
--- a/packages/@aws-cdk/aws-servicediscovery/lib/service.ts
+++ b/packages/@aws-cdk/aws-servicediscovery/lib/service.ts
@@ -262,37 +262,30 @@ export class Service extends cdk.Construct implements IService {
   /**
    * Registers a resource that is accessible using values other than an IP address or a domain name (CNAME).
    */
-  public registerNonIpInstance(props: NonIpInstanceBaseProps): IInstance {
-    return new NonIpInstance(this, "NonIpInstance", {
+  public registerNonIpInstance(id: string, props: NonIpInstanceBaseProps): IInstance {
+    return new NonIpInstance(this, id, {
       service: this,
-      instanceId: props.instanceId,
-      customAttributes: props.customAttributes
+      ...props
     });
   }
 
   /**
    * Registers a resource that is accessible using an IP address.
    */
-  public registerIpInstance(props: IpInstanceBaseProps): IInstance {
-    return new IpInstance(this, "IpInstance", {
+  public registerIpInstance(id: string, props: IpInstanceBaseProps): IInstance {
+    return new IpInstance(this, id, {
       service: this,
-      instanceId: props.instanceId,
-      ipv4: props.ipv4,
-      ipv6: props.ipv6,
-      port: props.port,
-      customAttributes: props.customAttributes
+      ...props
     });
   }
 
   /**
    * Registers a resource that is accessible using a CNAME.
    */
-  public registerCnameInstance(props: CnameInstanceBaseProps): IInstance {
-    return new CnameInstance(this, "CnameInstance", {
+  public registerCnameInstance(id: string, props: CnameInstanceBaseProps): IInstance {
+    return new CnameInstance(this, id, {
       service: this,
-      instanceId: props.instanceId,
-      instanceCname: props.instanceCname,
-      customAttributes: props.customAttributes
+      ...props
     });
   }
 }
diff --git a/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-cname-record.lit.ts b/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-cname-record.lit.ts
index fb90f1964324c..9a5e541ed7aff 100644
--- a/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-cname-record.lit.ts
+++ b/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-cname-record.lit.ts
@@ -14,7 +14,7 @@ const service = namespace.createService('Service', {
   dnsTtlSec: 30
 });
 
-service.registerCnameInstance({
+service.registerCnameInstance('CnameInstance', {
   instanceCname: 'service.pizza',
 });
 
diff --git a/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-http-namespace.lit.ts b/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-http-namespace.lit.ts
index adb465fee7200..0f4466f31c759 100644
--- a/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-http-namespace.lit.ts
+++ b/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-http-namespace.lit.ts
@@ -12,7 +12,7 @@ const service1 = namespace.createService('NonIpService', {
   description: 'service registering non-ip instances',
 });
 
-service1.registerNonIpInstance({
+service1.registerNonIpInstance('NonIpInstance', {
   customAttributes: { arn: 'arn:aws:s3:::mybucket' }
 });
 
@@ -24,7 +24,7 @@ const service2 = namespace.createService('IpService', {
   }
 });
 
-service2.registerIpInstance({
+service2.registerIpInstance('IpInstance', {
   ipv4: '54.239.25.192',
 });
 
diff --git a/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-public-dns-namespace.lit.ts b/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-public-dns-namespace.lit.ts
index 04ed6e9b19a78..a63a4358c2ee6 100644
--- a/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-public-dns-namespace.lit.ts
+++ b/packages/@aws-cdk/aws-servicediscovery/test/integ.service-with-public-dns-namespace.lit.ts
@@ -19,7 +19,7 @@ const service = namespace.createService('Service', {
   }
 });
 
-service.registerIpInstance({
+service.registerIpInstance('IpInstance', {
   ipv4: '54.239.25.192',
   port: 443
 });
diff --git a/packages/@aws-cdk/aws-servicediscovery/test/test.instance.ts b/packages/@aws-cdk/aws-servicediscovery/test/test.instance.ts
index bc17e6fae4ba8..5f0fa3951eb68 100644
--- a/packages/@aws-cdk/aws-servicediscovery/test/test.instance.ts
+++ b/packages/@aws-cdk/aws-servicediscovery/test/test.instance.ts
@@ -1,4 +1,4 @@
-import { expect, haveResource } from '@aws-cdk/assert';
+import { countResources, expect, haveResource } from '@aws-cdk/assert';
 import ec2 = require('@aws-cdk/aws-ec2');
 import elbv2 = require('@aws-cdk/aws-elasticloadbalancingv2');
 import cdk = require('@aws-cdk/cdk');
@@ -18,7 +18,7 @@ export = {
       name: 'service',
     });
 
-    service.registerIpInstance({
+    service.registerIpInstance('IpInstance', {
       ipv4: '10.0.0.0',
       ipv6: '0:0:0:0:0:ffff:a00:0',
       port: 443
@@ -56,7 +56,7 @@ export = {
       dnsRecordType: servicediscovery.DnsRecordType.A_AAAA
     });
 
-    service.registerIpInstance({
+    service.registerIpInstance('IpInstance', {
       ipv4: '54.239.25.192',
       ipv6: '0:0:0:0:0:ffff:a00:0',
       port: 443
@@ -96,7 +96,7 @@ export = {
       dnsRecordType: servicediscovery.DnsRecordType.A_AAAA
     });
 
-    service.registerIpInstance({
+    service.registerIpInstance('IpInstance', {
       ipv4: '10.0.0.0',
       ipv6: '0:0:0:0:0:ffff:a00:0',
       port: 443
@@ -136,7 +136,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerIpInstance({
+      service.registerIpInstance('IpInstance', {
         instanceId: 'id',
       });
     }, /A `port` must be specified for a service using a `SRV` record./);
@@ -159,7 +159,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerIpInstance({
+      service.registerIpInstance('IpInstance', {
         port: 3306
       });
     }, /At least `ipv4` or `ipv6` must be specified for a service using a `SRV` record./);
@@ -182,7 +182,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerIpInstance({
+      service.registerIpInstance('IpInstance', {
         port: 3306
       });
     }, /An `ipv4` must be specified for a service using a `A` record./);
@@ -205,7 +205,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerIpInstance({
+      service.registerIpInstance('IpInstance', {
         port: 3306
       });
     }, /An `ipv6` must be specified for a service using a `AAAA` record./);
@@ -228,7 +228,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerIpInstance({
+      service.registerIpInstance('IpInstance', {
         port: 3306
       });
     }, /Service must support `A`, `AAAA` or `SRV` records to register this instance type./);
@@ -338,7 +338,7 @@ export = {
       dnsRecordType: servicediscovery.DnsRecordType.CNAME
     });
 
-    service.registerCnameInstance({
+    service.registerCnameInstance('CnameInstance', {
       instanceCname: 'foo.com',
       customAttributes: { dogs: 'good' }
     });
@@ -375,7 +375,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerCnameInstance({
+      service.registerCnameInstance('CnameInstance', {
         instanceCname: 'foo.com',
       });
     }, /Namespace associated with Service must be a DNS Namespace/);
@@ -393,7 +393,7 @@ export = {
 
     const service = namespace.createService('MyService');
 
-    service.registerNonIpInstance({
+    service.registerNonIpInstance('NonIpInstance', {
       customAttributes: { dogs: 'good' }
     });
 
@@ -426,7 +426,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerNonIpInstance({
+      service.registerNonIpInstance('NonIpInstance', {
         instanceId: 'nonIp',
       });
     }, /This type of instance can only be registered for HTTP namespaces./);
@@ -446,7 +446,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerNonIpInstance({
+      service.registerNonIpInstance('NonIpInstance', {
         instanceId: 'nonIp',
       });
     }, /You must specify at least one custom attribute for this instance type./);
@@ -466,7 +466,7 @@ export = {
 
     // THEN
     test.throws(() => {
-      service.registerNonIpInstance({
+      service.registerNonIpInstance('NonIpInstance', {
         instanceId: 'nonIp',
         customAttributes: {}
       });
@@ -474,4 +474,29 @@ export = {
 
     test.done();
   },
+
+  'Register multiple instances on the same service'(test: Test) {
+    // GIVEN
+    const stack = new cdk.Stack();
+
+    const namespace = new servicediscovery.PublicDnsNamespace(stack, 'MyNamespace', {
+      name: 'public',
+    });
+
+    const service = namespace.createService('MyService');
+
+    // WHEN
+    service.registerIpInstance('First', {
+      ipv4: '10.0.0.0'
+    });
+
+    service.registerIpInstance('Second', {
+      ipv4: '10.0.0.1'
+    });
+
+    // THEN
+    expect(stack).to(countResources('AWS::ServiceDiscovery::Instance', 2));
+
+    test.done();
+  }
 };