Look up an ASN (like AS13335) or an IP address to see the network owner, RIR, and announced prefixes. Export prefixes to CSV. Updated: January 2026
Enter an ASN like AS13335 or just 13335.
This is the list of prefixes announced on BGP (as seen by RIPE RIS). Use it for allowlists/blocklists, routing checks, and security analysis.
| Prefix | Address family | Status |
|---|---|---|
| Run a lookup to load prefixes. | ||
Enter an IP address (IPv4 or IPv6). We’ll show the ASN, holder, and basic network info.
An Autonomous System Number (ASN) is an ID used on the Internet to describe a network (usually an ISP, cloud provider, or large organization). ASNs announce IP prefixes over BGP, which is how the Internet knows where to route traffic.