http://www.team-cymru.org/Services/ip-to-asn.html How to find out AS number for an IP address
IP to ASN Mapping - Team CymruApril 13, 2012 · AS, ASN, internet, ipv4, network · 1 minhttp://www.team-cymru.org/Services/ip-to-asn.htmlHow to find out AS number for an IP address