BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
216.140.0.0/14
Announced exactly
- 216.140.0.0/14AS3356Level 3 Parent, LLCRPKI Not found216.140.0.0
- Registry
- ARIN · United States · Dec 13, 1999
- Delegated block
- 216.140.0.0 – 216.143.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 216.141.81.0/24AS30622Venable LLPRPKI Not found216.141.81.0
- 216.141.251.0/24AS3356Level 3 Parent, LLCRPKI Not found216.141.251.0
- 216.142.36.0/24AS13904Cherryland Services IncRPKI Not found216.142.36.0
- 216.142.37.0/24AS13904Cherryland Services IncRPKI Not found216.142.37.0
- 216.142.158.0/24AS30647U.S.NEXT, Inc.RPKI Not found216.142.158.0
- 216.143.8.0/21AS62CyrusOne LLCRPKI Not found216.143.8.0
- 216.143.12.0/24AS396285Cincinnati Bell Technology SolutionsRPKI Not found216.143.12.0
- 216.143.116.0/24AS36589BARNES & NOBLE COLLEGE BOOKSELLERSRPKI Not found216.143.116.0
- 216.143.196.0/24AS31837Lionbridge Technologies, Inc.RPKI Not found216.143.196.0
- 216.143.232.0/24AS19622Genomic Health, Inc.RPKI Not found216.143.232.0
- 216.143.242.0/24AS29855Scientific Games, LLCRPKI Not found216.143.242.0
- 216.143.245.0/24AS13904Cherryland Services IncRPKI Not found216.143.245.0
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.