Find Asn from an IP address

AFRINIC Whois

AFRINIC regional WHOIS service

APNIC Whois

APNIC regional WHOIS service

ARIN Whois-RWS

ARIN regional WHOIS API

ASNLookup

Free ASN to prefix lookup

ASNmap

ASN to CIDR resolver by ProjectDiscovery

ASlookup

Look up ASN, owner and announced prefixes for an IP

BGP.tools

Real-time BGP routing visibility platform

BGPView

Free BGP routing data REST API

DB-IP

Geolocate an IP address to country, city, ISP and ASN

GeoLite2

Free MaxMind IP geolocation data

Hurricane Electric BGP Toolkit

Hurricane Electric free BGP toolkit

IP to ASN Database

Free IP-to-ASN dataset and lookup

IP2Location

IP geolocation database and API

IPLocation.net

Geolocate an IP across multiple databases

IPVoid

Check an IP against DNS blacklists and reputation sources

LACNIC Whois

LACNIC regional WHOIS service

Looking Glass Hurricane Electric

Hurricane Electric BGP looking glass

MXToolbox

a DNS, mail, blacklist, and network diagnostic platform for domain and IP inv

MaxMind GeoIP

Paid IP geolocation and network data

RIPEstat

RIPE NCC network statistics API

Spur

IP context API detecting VPNs, proxies and anonymised traffic

Team Cymru IP to ASN

Map an IP address to its origin ASN and BGP prefix

ip2geo.dev

Bulk IP geolocation API with Node, Bun and Deno SDKs

ipapi.co

Free IP geolocation API

ipdata.co

Paid IP enrichment with threat detection

ipinfo.io

Paid IP enrichment and geolocation API