BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
204.118.0.0/15
Announced exactly
- 204.118.0.0/15AS174Cogent Communications, LLCRPKI Not found204.118.0.0
- Registry
- ARIN · United States · Aug 12, 1994
- Delegated block
- 204.118.0.0 – 204.119.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 204.118.7.0/24AS1906Northrop GrummanRPKI Not found204.118.7.0
- 204.118.19.0/24AS54239BLOOMINGDALE HOME TELEPHONE COMPANY, INCRPKI Not found204.118.19.0
- 204.118.31.0/24AS174Cogent Communications, LLCRPKI Not found204.118.31.0
- 204.118.48.0/24AS40056Westgate Resorts LtdRPKI Not found204.118.48.0
- 204.118.63.0/24AS4972UNITED PARCEL SERVICERPKI Not found204.118.63.0
- 204.118.64.0/21AS26133Frankfort Plant BoardRPKI Not found204.118.64.0
- 204.118.72.0/21AS26133Frankfort Plant BoardRPKI Not found204.118.72.0
- 204.118.120.0/23AS15227LUMOS Networks, Inc.RPKI Not found204.118.120.0
- 204.119.0.0/23AS11404Wave BroadbandRPKI Not found204.119.0.0
- 204.119.3.0/24AS12044Willamette Valley InternetRPKI Not found204.119.3.0
- 204.119.24.0/24AS400317GoldConnectRPKI Valid204.119.24.0
- 204.119.27.0/24AS400317GoldConnectRPKI Not found204.119.27.0
- 204.119.60.0/24AS400317GoldConnectRPKI Not found204.119.60.0
- 204.119.64.0/18AS2828Verizon BusinessRPKI Not found204.119.64.0
- 204.119.138.0/23AS394601Global NexusRPKI Not found204.119.138.0
On the internet, routes are announced as prefixes: an autonomous system tells its neighbours via BGP that it can deliver traffic for, say, 193.166.0.0/15. This tool looks a prefix up in our daily copy of the global routing table and shows three things:
- Exact announcements: which AS originates exactly this prefix. More than one origin (a MOAS) is normal for anycast services and some multihomed networks, and suspicious otherwise.
- Covering routes: less-specific announcements that contain it. Traffic follows the most specific route, so a covering route matters if the more-specific one disappears.
- More-specifics: announcements inside it, which may belong to other networks (customers, or a hijack).
Each announced route is also checked against the RPKI: whether a ROA authorises its origin AS.
The table is the view from APNIC’s route collector. Most of the global table is the same from everywhere, but a route that is filtered before it reaches that collector will not appear.
Frequently asked questions
Why is my /24 not listed but a /16 is?
Your addresses are announced as part of the larger block, and no one announces the /24 separately. That is the normal case for most customers of a provider.
What is a more-specific hijack?
Someone announces a longer prefix inside your space. Because routers prefer the most specific route, traffic goes to them. RPKI with a strict max length makes such announcements invalid.
Can I enter a single address?
Yes. The tool then shows the most specific announced route that contains it.