diff --git a/modules/@angular/router/src/url_serializer.ts b/modules/@angular/router/src/url_serializer.ts
index 1dbd74d17c..bdc6755f29 100644
--- a/modules/@angular/router/src/url_serializer.ts
+++ b/modules/@angular/router/src/url_serializer.ts
@@ -1,4 +1,5 @@
 import { UrlTree, UrlSegment } from './url_tree';
+import { PRIMARY_OUTLET } from './shared';
 import { rootNode, TreeNode } from './utils/tree';
 
 /**
@@ -54,7 +55,8 @@ function serializeChildren(node: TreeNode<UrlSegment>): string {
 }
 
 export function serializeSegment(segment: UrlSegment): string {
-  return `${segment.path}${serializeParams(segment.parameters)}`;
+  const outlet = segment.outlet === PRIMARY_OUTLET ? '' : `${segment.outlet}:`;
+  return `${outlet}${segment.path}${serializeParams(segment.parameters)}`;
 }
 
 function serializeParams(params: {[key: string]: string}): string {
@@ -105,41 +107,58 @@ class UrlParser {
 
   parseRootSegment(): TreeNode<UrlSegment> {
     if (this.remaining  == '' || this.remaining == '/') {
-      return new TreeNode<UrlSegment>(new UrlSegment('', {}), []);
+      return new TreeNode<UrlSegment>(new UrlSegment('', {}, PRIMARY_OUTLET), []);
     } else {
-      let segments = this.parseSegments();
-      return new TreeNode<UrlSegment>(new UrlSegment('', {}), segments);
+      const segments = this.parseSegments(false);
+      return new TreeNode<UrlSegment>(new UrlSegment('', {}, PRIMARY_OUTLET), segments);
     }
   }
 
-  parseSegments(): TreeNode<UrlSegment>[] {
+  parseSegments(hasOutletName: boolean): TreeNode<UrlSegment>[] {
     if (this.remaining.length == 0) {
       return [];
     }
     if (this.peekStartsWith('/')) {
       this.capture('/');
     }
-    var path = matchUrlSegment(this.remaining);
+    let path = matchUrlSegment(this.remaining);
     this.capture(path);
 
-    var matrixParams: {[key: string]: any} = {};
+    let outletName;
+    if (hasOutletName) {
+      if (path.indexOf(":") === -1) {
+        throw new Error("Not outlet name is provided");
+      }
+      if (path.indexOf(":") > -1 && hasOutletName) {
+        let parts = path.split(":");
+        outletName = parts[0];
+        path = parts[1];
+      }
+    } else {
+      if (path.indexOf(":") > -1) {
+        throw new Error("Not outlet name is allowed");
+      }
+      outletName = PRIMARY_OUTLET;
+    }
+
+    let matrixParams: {[key: string]: any} = {};
     if (this.peekStartsWith(';')) {
       matrixParams = this.parseMatrixParams();
     }
 
-    var secondary = [];
+    let secondary = [];
     if (this.peekStartsWith('(')) {
       secondary = this.parseSecondarySegments();
     }
 
-    var children: TreeNode<UrlSegment>[] = [];
+    let children: TreeNode<UrlSegment>[] = [];
     if (this.peekStartsWith('/') && !this.peekStartsWith('//')) {
       this.capture('/');
-      children = this.parseSegments();
+      children = this.parseSegments(false);
     }
 
-    let segment = new UrlSegment(path, matrixParams);
-    let node = new TreeNode<UrlSegment>(segment, children);
+    const segment = new UrlSegment(path, matrixParams, outletName);
+    const node = new TreeNode<UrlSegment>(segment, children);
     return [node].concat(secondary);
   }
 
@@ -215,7 +234,7 @@ class UrlParser {
     this.capture('(');
 
     while (!this.peekStartsWith(')') && this.remaining.length > 0) {
-      segments = segments.concat(this.parseSegments());
+      segments = segments.concat(this.parseSegments(true));
       if (this.peekStartsWith('//')) {
         this.capture('//');
       }
diff --git a/modules/@angular/router/src/url_tree.ts b/modules/@angular/router/src/url_tree.ts
index 915c4c6b98..84608c0542 100644
--- a/modules/@angular/router/src/url_tree.ts
+++ b/modules/@angular/router/src/url_tree.ts
@@ -1,5 +1,10 @@
 import { Tree, TreeNode } from './utils/tree';
 import { shallowEqual } from './utils/collection';
+import { PRIMARY_OUTLET } from './shared';
+
+export function createEmptyUrlTree() {
+  return new UrlTree(new TreeNode<UrlSegment>(new UrlSegment("", {}, PRIMARY_OUTLET), []), {}, null);
+}
 
 /**
  * A URL in the tree form.
@@ -11,17 +16,18 @@ export class UrlTree extends Tree<UrlSegment> {
 }
 
 export class UrlSegment {
-  constructor(public path: string, public parameters: {[key: string]: string}) {}
+  constructor(public path: string, public parameters: {[key: string]: string}, public outlet: string) {}
 
   toString() {
-    let params = [];
+    const params = [];
     for (let prop in this.parameters) {
       if (this.parameters.hasOwnProperty(prop)) {
         params.push(`${prop}=${this.parameters[prop]}`);
       }
     }
     const paramsString = params.length > 0 ? `(${params.join(',')})` : '';
-    return `${this.path}${paramsString}`;
+    const outlet = this.outlet === PRIMARY_OUTLET ? '' : `${this.outlet}:`;
+    return `${outlet}${this.path}${paramsString}`;
   }
 }
 
diff --git a/modules/@angular/router/test/url_serializer.spec.ts b/modules/@angular/router/test/url_serializer.spec.ts
index f3298be503..6c695a0ee1 100644
--- a/modules/@angular/router/test/url_serializer.spec.ts
+++ b/modules/@angular/router/test/url_serializer.spec.ts
@@ -2,60 +2,61 @@ import {DefaultUrlSerializer, serializeSegment} from '../src/url_serializer';
 import {UrlSegment} from '../src/url_tree';
 
 describe('url serializer', () => {
-  let url = new DefaultUrlSerializer();
+  const url = new DefaultUrlSerializer();
 
   it('should parse the root url', () => {
-    let tree = url.parse("/");
+    const tree = url.parse("/");
     expectSegment(tree.root, "");
     expect(url.serialize(tree)).toEqual("");
   });
 
   it('should parse non-empty urls', () => {
-    let tree = url.parse("one/two");
-    let one = tree.firstChild(tree.root);
+    const tree = url.parse("one/two");
+    const one = tree.firstChild(tree.root);
+
     expectSegment(one, "one");
     expectSegment(tree.firstChild(<any>one), "two");
     expect(url.serialize(tree)).toEqual("/one/two");
   });
 
   it("should parse multiple secondary segments", () => {
-    let tree = url.parse("/one/two(three//four)/five");
-    let c = tree.children(<any>tree.firstChild(tree.root));
+    const tree = url.parse("/one/two(left:three//right:four)/five");
+    const c = tree.children(<any>tree.firstChild(tree.root));
 
     expectSegment(c[0], "two");
-    expectSegment(c[1], "three");
-    expectSegment(c[2], "four");
+    expectSegment(c[1], "left:three");
+    expectSegment(c[2], "right:four");
 
     expectSegment(tree.firstChild(c[0]), "five");
 
-    expect(url.serialize(tree)).toEqual("/one/two(three//four)/five");
+    expect(url.serialize(tree)).toEqual("/one/two(left:three//right:four)/five");
   });
 
   it("should parse secondary segments that have secondary segments", () => {
-    let tree = url.parse("/one(/two(/three))");
-    let c = tree.children(tree.root);
+    const tree = url.parse("/one(left:two(right:three))");
+    const c = tree.children(tree.root);
 
     expectSegment(c[0], "one");
-    expectSegment(c[1], "two");
-    expectSegment(c[2], "three");
+    expectSegment(c[1], "left:two");
+    expectSegment(c[2], "right:three");
 
-    expect(url.serialize(tree)).toEqual("/one(two//three)");
+    expect(url.serialize(tree)).toEqual("/one(left:two//right:three)");
   });
 
   it("should parse secondary segments that have children", () => {
-    let tree = url.parse("/one(/two/three)");
-    let c = tree.children(tree.root);
+    const tree = url.parse("/one(left:two/three)");
+    const c = tree.children(tree.root);
 
     expectSegment(c[0], "one");
-    expectSegment(c[1], "two");
+    expectSegment(c[1], "left:two");
     expectSegment(tree.firstChild(c[1]), "three");
 
-    expect(url.serialize(tree)).toEqual("/one(two/three)");
+    expect(url.serialize(tree)).toEqual("/one(left:two/three)");
   });
 
   it("should parse an empty secondary segment group", () => {
-    let tree = url.parse("/one()");
-    let c = tree.children(tree.root);
+    const tree = url.parse("/one()");
+    const c = tree.children(tree.root);
 
     expectSegment(c[0], "one");
     expect(tree.children(c[0]).length).toEqual(0);
@@ -64,48 +65,48 @@ describe('url serializer', () => {
   });
 
   it("should parse key-value matrix params", () => {
-    let tree = url.parse("/one;a=11a;b=11b(two;c=22//three;d=33)");
-    let c = tree.children(tree.root);
+    const tree = url.parse("/one;a=11a;b=11b(left:two;c=22//right:three;d=33)");
+    const c = tree.children(tree.root);
 
     expectSegment(c[0], "one;a=11a;b=11b");
-    expectSegment(c[1], "two;c=22");
-    expectSegment(c[2], "three;d=33");
+    expectSegment(c[1], "left:two;c=22");
+    expectSegment(c[2], "right:three;d=33");
 
-    expect(url.serialize(tree)).toEqual("/one;a=11a;b=11b(two;c=22//three;d=33)");
+    expect(url.serialize(tree)).toEqual("/one;a=11a;b=11b(left:two;c=22//right:three;d=33)");
   });
 
   it("should parse key only matrix params", () => {
-    let tree = url.parse("/one;a");
+    const tree = url.parse("/one;a");
 
-    let c = tree.firstChild(tree.root);
+    const c = tree.firstChild(tree.root);
     expectSegment(c, "one;a=true");
 
     expect(url.serialize(tree)).toEqual("/one;a=true");
   });
 
   it("should parse query params", () => {
-    let tree = url.parse("/one?a=1&b=2");
+    const tree = url.parse("/one?a=1&b=2");
     expect(tree.queryParameters).toEqual({a: '1', b: '2'});
   });
 
   it("should parse key only query params", () => {
-    let tree = url.parse("/one?a");
+    const tree = url.parse("/one?a");
     expect(tree.queryParameters).toEqual({a: 'true'});
   });
 
   it("should serializer query params", () => {
-    let tree = url.parse("/one?a");
+    const tree = url.parse("/one?a");
     expect(url.serialize(tree)).toEqual("/one?a=true");
   });
 
   it("should parse fragment", () => {
-    let tree = url.parse("/one#two");
+    const tree = url.parse("/one#two");
     expect(tree.fragment).toEqual("two");
     expect(url.serialize(tree)).toEqual("/one#two");
   });
 
   it("should parse empty fragment", () => {
-    let tree = url.parse("/one#");
+    const tree = url.parse("/one#");
     expect(tree.fragment).toEqual("");
     expect(url.serialize(tree)).toEqual("/one#");
   });