node-rwhois

'use strict';
var rwhois = require('rwhois')
var app = rwhois()

//handle ipv4 queries
app.query('ipv4',function(req,next){
  //use the values in the request object to structure the response
  console.log(req) //{query: '192.168.1.100', limit: 20}
  next(
    //report any errors here
    null,
    //this is the response, it can be an array or line delimited text
    [
      'network:ID:NET-IBMNET-3.0.0.0/0',
      'network:Auth-Area:0.0.0.0/0',
      'network:Network-Name:IBMNET-3',
      'network:IP-Network:123.45.67.0/24',
      'network:Org-Name:IBM',
      'network:Street-Address:1234 Maneck Avenue',
      'network:City:Black Plains',
      'network:State:NY',
      'network:Postal-Code:12345',
      'network:Country-Code:US',
      'network:Tech-Contact;I:MG305.COM',
      'network:Updated:19931120123455000',
      'network:Updated-By:[email protected]',
      'network:Class-Name:network'
    ]
    //this is a referral to another server
    ,'rwhois://rwhois.arin.net:4321/auth-area=.'
  )
})

//setup and listen
app.listen()

{
  author: 'ESITED LLC',
  protocol: '1.5',
  capabilities: '003fff:00',
  port: 4321,
  hostname: 'localhost'
}

var app = rwhois({
  author: 'My Company',
  port: 1234,
  hostname: 'whois.mycompany.net'
})