1.0.5 • Public • Published


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This tiny package allows you to obtain ASN meta information for any IP address. Some IP addresses are of course not assigned to an ASN.


npm install asn-from-ip

If you want to clone the repository directly from GitHub instead:

git clone

Usage from Node.js

Lookup the IP address

const { ipToASN } = require('asn-from-ip');

(async () => {
  console.log(await ipToASN(''));

which outputs (at the time of writing):

  asn: 3209,
  route: '',
  descr: 'VODANET International IP-Backbone of Vodafone, DE',
  country: 'de',
  active: true,
  org: 'Vodafone GmbH',
  domain: '',
  abuse: '',
  type: 'isp',
  created: '2002-09-11',
  updated: '2023-10-12',
  rir: 'ripe',
  whois: ''

Most IP addresses can be associated with an Autonomeous System (AS). The return value of ipToASN() is an object with the following attributes:

  • asn - int - The AS number
  • route - string - The IP route as CIDR in this AS
  • descr - string - An informational description of the AS
  • country - string - The country where the AS is situated in (administratively)
  • active - string - Whether the AS is active (active = at least one route administred by the AS)
  • domain - string - The domain of the organization to which this AS belongs
  • org - string - The organization responisible for this AS
  • type - string - The type for this ASN, this is either hosting, education, goverment, banking, business or isp
  • created - string - When the ASN was established
  • updated - string - The last time the ASN was updated
  • rir - string - To which Regional Internet Registry the ASN belongs
  • whois - string - An url to the whois information for this ASN

For inactive autonomeous systems, most of the above information is not available.

Usage from the Browser

Copy the browser JavaScript bundle to your preferred location. After installing the module with

npm install asn-from-ip

you can find the minified JavaScript here: node_modules/asn-from-ip/dist/ipToASN.min.js

<!doctype html>

<html lang="en">

  <meta charset="utf-8">
  <title>IP to ASN Example Browser</title>
  <meta name="description" content="IP to ASN Example">
  <meta name="author" content="">

  <pre id="asn"></pre>
  <script type="text/javascript" src="dist/ipToASN.min.js"></script>
  <script type="text/javascript">
    ipToASN('').then((res) => {
      document.getElementById('asn').innerText = JSON.stringify(res, null, 2);


Use the Database Directly

This package uses the API in order to avoid shipping a huge database in the npm module. If you have a large volume of IP addresses to lookup, you can download the full & free ASN Database.

GitHub mirror of the database: ASN Database Mirror

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npm i asn-from-ip

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