ASN OSINT Tools

OWASP Amass

Attack-surface mapping and DNS enumeration

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

Cloudflare Radar

Internet trends and DDoS data from Cloudflare

Hurricane Electric BGP Toolkit

Hurricane Electric free BGP toolkit

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

OWASP ASST

OWASP Amass companion utilities

PeeringDB

Public database of network peering data

RIPEstat

RIPE NCC network statistics API

Shadowserver Dashboard

Free dashboard of compromised hosts and exposed services by country and ASN