ASN lookup
Enter an autonomous system number to see its published attributes for the 2026-11 release:
name, organisation, registry record, routed IPv4 footprint, where its /24 blocks geolocate,
routing security, risk signals and its prefixes. Everything is read directly from the monthly data in your
browser; nothing is sent to a server. To look up an address instead, use the
Prefix lookup.
An ASN is listed when it originates at least one routed /24 in the release. Counts are
/24 blocks of the monthly dataset; countries follow the dataset's country scope (the RIR
unallocated reserve counts for no country). Data source: the current monthly release.