README.md

haraka-plugin-asn

look up ASN from local GeoIP databases and/or DNS based providers.

DNS providers

• origin.asn.cymru.com
• asn.routeviews.org
• asn.rspamd.com

Databases

• MaxMind ASN database

PS: Run something like maxmind-geolite-mirror weekly to keep your database files up-to-date.