ASN Lookup

Enter an AS number, an IP address or an organization name to see the organization and all IPv4/IPv6 ranges mapped to it in the GeoLite2-ASN database.

Examples: AS15169 · AS16509 · AS13335 · AS4766 · AS9318 · 8.8.8.8 · Kakao

Frequently asked questions

What is an ASN?

An autonomous system number identifies a network operated under one routing policy — an ISP, a cloud provider or a large company. Each AS announces the IP ranges it is responsible for over BGP.

How do I find the ASN of an IP address?

Look the address up on IP Address Lookup. The ASN card links straight back to this page.

Why is the range list different from what BGP tools show?

This list comes from the GeoLite2-ASN database (refreshed twice a week), not a live BGP feed, and adjacent ranges are merged. Very new or short-lived announcements may not appear yet.