hostname-is-private 

> Check whether or not an hostname refers to a private IP

Setup

``shell
npm install hostname-is-private
`

Usage

#### isPrivate(hostname: {String}, f: (err : {Error,Null}, isPrivate: {Boolean}))

`javascript
var isPrivate = require('hostname-is-private').isPrivate;

isPrivate('127.0.0.1.xip.io', function(err, isPrivate){
console.log(err === null, isPrivate == true);
});

isPrivate('localhost', function(err, isPrivate){
console.log(err === null, isPrivate === true);
});

isPrivate('google.com', function(err, isPrivate){
console.log(err === null, isPrivate === false);
});
`

#### isPrivateIncludingPublicIp(hostname: {String}, f: (err : {Error,Null}, isPrivateIncludingPublicIp: {Boolean}))

`javascript
var isPrivateIncludingPublicIp = require('hostname-is-private').isPrivateIncludingPublicIp;

isPrivateIncludingPublicIp('YOUR-PUBLIC-IP.xip.io', function(err, isPrivate){
console.log(err === null, isPrivate == true);
});

isPrivate('localhost', function(err, isPrivate){
console.log(err === null, isPrivate === true);
});

isPrivate('google.com', function(err, isPrivate){
console.log(err === null, isPrivate === false);
});
``

How it works

It uses dns.lookup underneath and ip.isPrivate to check if the resolved IP is private (or not).

Changelog