hostname-is-private

Check whether or not an hostname refers to a private IP

Setup

npm install hostname-is-private

Usage

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

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}))

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