BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
204.252.0.0/14
Announced exactly
- 204.252.0.0/14AS701Verizon BusinessRPKI Not found204.252.0.0
- Registry
- ARIN · United States · Feb 1, 1995
- Delegated block
- 204.252.0.0 – 204.255.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 204.252.163.0/24AS26683BB - Dash Financial Technologies LLCRPKI Valid204.252.163.0
- 204.252.180.0/22AS4497Upsala Co-operative Telephone AssociationRPKI Not found204.252.180.0
- 204.252.200.0/24AS22883CondeNast PublicationsRPKI Not found204.252.200.0
- 204.253.48.0/24AS11160COSTAR GROUP Inc.RPKI Not found204.253.48.0
- 204.253.66.0/24AS397056AgWorks, LLCRPKI Valid204.253.66.0
- 204.253.82.0/24AS168311Finity Americas, Inc.RPKI Not found204.253.82.0
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.