BGP Route Lookup

BGP route lookup

Which network announces this address block, and who is responsible for it?

Try: 8.8.8.8

How this lookup works

The check asks RIPEstat, the RIPE NCC's routing data service, which prefix covers the IP address in the global routing table and which autonomous system (AS) announces it. RIPEstat builds this from BGP data collected by route collectors around the world, so it shows what the internet as a whole sees, not one provider's view.

How to read the results

  • Announced prefix is the most specific block in the routing table that contains the address, such as 203.0.113.0/24. Traffic to the address follows the route for this prefix.
  • Origin AS is the network that announces the prefix: usually the ISP, cloud provider or hosting company that operates the address.
  • AS name and holder come from the AS's registration record.
  • Not announced means no route for the address was seen. Unannounced space can't receive traffic from the internet. It's common for newly allocated or reserved blocks.

When it's useful

Finding who runs an address. The origin AS is the network actually routing it today, which can differ from the organisation in IP Whois when space is leased or reassigned.

Checking a new announcement. After you start announcing a prefix, confirm that collectors see it with the right origin AS. If the AS is wrong, check your route origin authorisation (ROA) and your provider's filters.

Investigating abuse. Report to the abuse contact of the origin AS when the registered owner doesn't respond. The IP Whois guide covers writing an effective abuse report.

Updated 26 October 2026

Related checks

  • What Is My IP?

    Which public address does the internet see for me, and what does its reverse DNS say?

  • IP Whois

    Who owns this IP address, and where do I report abuse from it?

  • Reverse DNS Lookup

    Which hostname does this IP address claim, and does that name point back?

FAQ

What is an AS number?

An Autonomous System is a network that operates its own routing policy, and the AS number is its globally unique identifier. AS15169, for example, is Google's primary AS.

Why is nothing announced for this address?

Reserved and special-use ranges are never announced, and newly allocated blocks often are not yet. If you are announcing the prefix and collectors do not see it, check the route object and your provider's filters.

Why does the owner differ from IP Whois?

IP Whois shows the registry's record of who the block is assigned to. BGP shows the network actually announcing it, which can be a different organisation when space is leased or reannounced — the address is the same but the route belongs to someone else.