IP to ASN database Free download

Our free IP to ASN database maps IP address ranges to their Autonomous System Number (ASN), along with the organization that owns the ASN. It's ideal for understanding network ownership and traffic sources. Like our other free databases, it is updated daily.

Data fields

The IP to ASN database includes the following data fields for each IP network range.

Attribute	Description	Example
network	The IP address range in CIDR notation.	104.23.0.0/19
asn	The Autonomous System Number.	132892
country_code	The two-letter ISO 3166-1 alpha-2 country code where the ASN is registered.	US
name	The short name of the ASN.	CLOUDFLARE
org	The name of the organization that owns the ASN.	Cloudflare, Inc.
domain	The domain name of the organization.	cloudflare.com

Example

Look up an IP address using the MMDB database

Here's how to perform a local lookup using our MMDB database file with Node.js.

get_asn_from_ip_address.js

import fs from 'fs';
import * as mmdb from 'mmdb-lib'; // npm install mmdb-lib

const db = fs.readFileSync('/path/to/ip-to-asn.mmdb');

const reader = new mmdb.Reader(db);
console.log(reader.get('104.23.1.8'));
// {
//   asn: 132892,
//   country_code: 'US',
//   name: 'CLOUDFLARE',
//   org: 'Cloudflare, Inc.',
//   domain: 'cloudflare.com',
//   network: '104.23.0.0/19'
// }