ASN Lookup — Find Autonomous System by IP

101IP identifies the autonomous system (ASN) of any IP address or domain. An ASN is a unique number assigned to an ISP, hosting provider or large organisation's network.

What ASN Lookup returns

• ASN — autonomous system number (e.g. AS15169 for Google);
• Prefix — CIDR range of IP addresses in this network;
• Country — country where the ASN is registered;
• Registry — ARIN, RIPE, APNIC, LACNIC or AFRINIC;
• Owner — organisation name that owns the ASN.