diff --git a/.travis.yml b/.travis.yml
index 1013daa..4994fd0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,15 +1,56 @@
 language: node_js
 node_js: '6'
-env:
-  - VERSION=0.3.1
-  - VERSION=0.4.1
-  - VERSION=0.16.0
-  - VERSION=0.24.0
-  - VERSION=0.25.0
+matrix:
+  include:
+    - os: linux
+      env:
+        - VERSION=0.3.1
+    - os: linux
+      env:
+        - VERSION=0.4.1
+    - os: linux
+      env:
+        - VERSION=0.16.0
+    - os: linux
+      env:
+        - VERSION=0.24.0
+    - os: linux
+      env:
+        - VERSION=0.25.0
+    - os: osx
+      osx_image: xcode9
+      env:
+        - VERSION=0.3.1
+    - os: osx
+      osx_image: xcode9
+      env:
+        - VERSION=0.4.1
+    - os: osx
+      osx_image: xcode9
+      env:
+        - VERSION=0.16.0
+    - os: osx
+      osx_image: xcode9
+      env:
+        - VERSION=0.24.0
+    - os: osx
+      osx_image: xcode9
+      env:
+        - VERSION=0.25.0
+before_install:
+  - OS=linux
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      rvm install ruby-2.4.0;
+      rvm --default use 2.4.0;
+      ruby -v;
+      brew update;
+      brew install xz;
+      OS=darwin;
+    fi
 script:
   - npm i
   - mkdir -p ./node_modules/.bin
-  - curl -SL "https://github.com/fibjs/fibjs/releases/download/v${VERSION}/fibjs-v${VERSION}-linux-x64.xz" -o ./node_modules/.bin/fibjs.xz
+  - curl -SL "https://github.com/fibjs/fibjs/releases/download/v${VERSION}/fibjs-v${VERSION}-${OS}-x64.xz" -o ./node_modules/.bin/fibjs.xz
   - xz -d ./node_modules/.bin/fibjs.xz
   - chmod a+x ./node_modules/.bin/fibjs
   - npm run ci
diff --git a/index.js b/index.js
index b445bb2..bc9d88d 100644
--- a/index.js
+++ b/index.js
@@ -1,18 +1,17 @@
 'use strict';
 
-const TcpServer = require('net').TcpServer;
+const Socket = require('net').Socket;
 
-module.exports = function detectPort(port) {
+module.exports = function detectPort(port, address = '') {
   let svr;
+  svr = new Socket();
   try {
-    svr = new TcpServer(port, () => { });
-    svr.run(() => {});
+    svr.bind(address, port);
   } catch (error) {
-    svr = new TcpServer(0, () => { });
-    svr.run(() => {});
+    svr.bind(address, 0);
   } finally {
-    port = svr.socket.localPort;
-    svr.stop();
+    port = svr.localPort;
+    svr.close();
     return port;
   }
 };
diff --git a/readme.md b/readme.md
index c331345..742b4a4 100644
--- a/readme.md
+++ b/readme.md
@@ -51,6 +51,13 @@ if (availablePort === port) {
 }
 ```
 
+## API
+
+### detectPort(port, address = '')
+
+- port Integer. the port to be detected.
+- address String. Specific the address to detect, default to "*".
+
 ## Questions & Suggestions
 
 Please open an issue [here](https://github.com/fibjs-modules/detect-port/issues).
diff --git a/test/index.test.js b/test/index.test.js
index 29ada63..0177794 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -1,5 +1,7 @@
+'use strict';
+
 const test = require("test");
-const http = require("http");
+const TcpServer = require('net').TcpServer;
 const detectPort = require('../');
 
 test.setup();
@@ -10,11 +12,25 @@ describe('detectPort', () => {
   });
 
   it("random port", () => {
-    let svr = new http.Server(3000, () => { });
+    let svr = new TcpServer(3000, () => { });
     svr.run(() => {});
     assert.notEqual(detectPort(3000), 3000);
     svr.stop();
   });
+
+  it("same address", () => {
+    let svr = new TcpServer('127.0.0.1', 3000, () => { });
+    svr.run(() => {});
+    assert.notEqual(detectPort(3000, '127.0.0.1'), 3000);
+    svr.stop();
+  });
+
+  it("different address", () => {
+    let svr = new TcpServer('127.0.0.1', 3000, () => { });
+    svr.run(() => {});
+    assert.equal(detectPort(3000), 3000);
+    svr.stop();
+  });
 });
 
 process.exit(test.run(console.DEBUG));