https://github.com/cloudron-io/asnlookup

https://github.com/cloudron-io/asnlookup

Last synced: 12 days ago
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• Host: GitHub
• URL: https://github.com/cloudron-io/asnlookup
• Owner: cloudron-io
• Created: 2021-07-26T15:15:07.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2021-08-10T20:34:54.000Z (over 3 years ago)
• Last Synced: 2024-03-14T13:42:22.347Z (8 months ago)
• Language: JavaScript
• Size: 52.7 KB
• Stars: 6
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# asnlookup

Node.JS module for getting ASN for a given IP address. It uses data from

http://thyme.apnic.net/current/ .

Mostly inspired by https://www.npmjs.com/package/iptoasn but without native code and using async/await instead of callback style.

## Installation

`npm install --save asnlookup`

## Description

This module downloads raw BGP table (~13MB) and ASN to name mapping (~2MB)

files from http://thyme.apnic.net/current/ and converts them into a more useful

format that allows for a quick search.

WARNING: To improve the lookup speed by a lot only /16 at most is currently supported as the first 2 bytes of the address is used for quick lookup!

On the upside this makes it more specific for ranges covered by various ASNs

## Usage

```javascript

'use strict';

// you must pass a filepath for the local cache, otherwise .asnlookup.cache will be used

const asnlookup = require('./index.js')('.asnlookup.cache');

(async function() {

    const testArray = [

        '8.8.8.8',

        '50.22.180.100',

        '1.2.3.4',

        '104.16.181.15',

        '127.0.0.1',

        'asd'

    ];

    // call .load() for an attempt to load the local cache, this will require 10s of MB of memory!

    await asnlookup.load();

    // check when the cache was updated

    // lastUpdated are days

    // lastUpdated is Infinity if there's no cache at all

    const lastUpdated = asnlookup.lastUpdated();

    console.log(`Last updated ${lastUpdated} days ago.`);

    // update the cache if it's older than 31 days

    if (lastUpdated > 31) {

        console.log('Cache too old or never created. Updating...');

        await asnlookup.update();

    }

    testArray.forEach(function(ip) {

        console.log(ip, '-', asnlookup.lookup(ip));

    });

})();

```

Result of this sample script:

```

Last updated 0 days ago.

8.8.8.8 - LEVEL3

50.22.180.100 - SOFTLAYER

1.2.3.4 - null

104.16.181.15 - CLOUDFLARENET

127.0.0.1 - null

asd - null

```