BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
66.236.0.0/14
Announced exactly
- 66.236.0.0/14AS2828Verizon BusinessRPKI Not found66.236.0.0
- Registry
- ARIN · United States · Feb 20, 2002
- Delegated block
- 66.236.0.0 – 66.239.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 66.238.4.0/22AS11404Wave BroadbandRPKI Not found66.238.4.0
- 66.238.54.0/24AS2828Verizon BusinessRPKI Not found66.238.54.0
- 66.238.186.0/24AS29819Natural Networks, Inc.RPKI Not found66.238.186.0
- 66.238.224.0/24AS9498BHARTI Airtel Ltd.RPKI Not found66.238.224.0
- 66.238.238.0/24AS7046Verizon BusinessRPKI Not found66.238.238.0
- 66.239.111.0/24AS31835Contour NetworksRPKI Not found66.239.111.0
- 66.239.222.0/24AS701Verizon BusinessRPKI Not found66.239.222.0
On the internet, routes are announced as prefixes: an autonomous system tells its neighbours via BGP that it can deliver traffic for, say, 62.103.0.0/16. 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.