BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
72.236.0.0/15
Announced exactly
- 72.236.0.0/15AS3356Level 3 Parent, LLCRPKI Not found72.236.0.0
- Registry
- ARIN · United States · Apr 27, 2005
- Delegated block
- 72.236.0.0 – 72.237.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 72.236.26.0/24AS20182ESSENT GUARANTY, INC.RPKI Not found72.236.26.0
- 72.236.28.0/24AS10858Hypertherm Inc.RPKI Not found72.236.28.0
- 72.236.86.0/23AS64200VIVID-HOSTING LLCRPKI Not found72.236.86.0
- 72.236.92.0/24AS55204ClearPointRPKI Not found72.236.92.0
- 72.236.101.0/24AS55204ClearPointRPKI Not found72.236.101.0
- 72.236.147.0/24AS23209Virginia Housing Development AuthorityRPKI Not found72.236.147.0
- 72.236.226.0/24AS25873MERCY MEDICAL CENTERRPKI Not found72.236.226.0
- 72.236.255.0/24AS3356Level 3 Parent, LLCRPKI Not found72.236.255.0
- 72.237.4.0/24AS26808Utica UniversityRPKI Not found72.237.4.0
- 72.237.30.0/24AS19674Navpoint InternetRPKI Not found72.237.30.0
- 72.237.36.0/24AS64200VIVID-HOSTING LLCRPKI Not found72.237.36.0
- 72.237.48.0/24AS26372Vermont Information ProcessingRPKI Not found72.237.48.0
- 72.237.51.0/24AS25750Southwestern Vermont Health Care CorporationRPKI Not found72.237.51.0
- 72.237.76.0/23AS16567Netrix LLCRPKI Not found72.237.76.0
- 72.237.76.0/24AS16567Netrix LLCRPKI Not found72.237.76.0
- 72.237.77.0/24AS16567Netrix LLCRPKI Not found72.237.77.0
- 72.237.88.0/22AS40047Intermediate Unit 1RPKI Not found72.237.88.0
- 72.237.159.0/24AS27548United States Advanced Network Inc.RPKI Not found72.237.159.0
- 72.237.170.0/23AS62841City of New OrleansRPKI Not found72.237.170.0
- 72.237.174.0/24AS3356Level 3 Parent, LLCRPKI Not found72.237.174.0
- 72.237.184.0/24AS15085Immedion, LLCRPKI Not found72.237.184.0
- 72.237.212.0/24AS13602I-Evolve Technology ServicesRPKI Not found72.237.212.0
- 72.237.213.0/24AS13602I-Evolve Technology ServicesRPKI Not found72.237.213.0
- 72.237.216.0/24AS3356Level 3 Parent, LLCRPKI Not found72.237.216.0
- 72.237.219.0/24AS3356Level 3 Parent, LLCRPKI Not found72.237.219.0
- 72.237.220.0/24AS21969Firstsource Advantage LLCRPKI Not found72.237.220.0
- 72.237.238.0/23AS3356Level 3 Parent, LLCRPKI Not found72.237.238.0
On the internet, routes are announced as prefixes: an autonomous system tells its neighbours via BGP that it can deliver traffic for, say, 49.224.0.0/14. 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.