Awesome-ASN

Resources for dealing with Autonomous System Numbers (ASN).

Canonical Repo Sources

This repo is officially available from the following sources:

Articles and Howtos

Top 6 ASN Lookup Tools to fetch Autonomous System Information

APIs and Raw ASN Lists

iptoasn.com:Free IP address to ASN database - A variety of TSV (TAB-separated values) files can be downloaded from iptoasn.com.
API: IP2ASN (free) — DNSlytics API documentation

Lookup and Conversion Tools

asn: ASN / RPKI validity / BGP stats / IPv4v6 / Prefix / URL / ASPath / Organization / IP reputation and geolocation lookup tool / Traceroute server
asnip: ASN target organization IP range attack surface mapping for reconnaissance, fast and lightweight
Asnlookup: Leverage ASN to look up IP addresses (IPv4 & IPv6) owned by a specific organization for reconnaissance purposes, then run port scanning on it.
asnrecon: ASN reconnaissance script
asnap: asnap aims to render recon phase easier by providing updated data about which companies owns which ipv4 or ipv6 addresses and allows the user to automate initial port and service scanning.
iptoasn-webservice: Web service to map IP addresses to Autonomous System Number information, using iptoasn.com (Rust)
ip2asn: IP address to Autonomous System Number (Ruby)
asn-lookup: Bash script to lookup the Autonomous System Number of a domain. (Ruby)
asn_translate: Translates an Autonomous System Number into its assigned organization (Bash Shell)

Drop Lists