BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
199.92.0.0/14
Announced exactly
- 199.92.0.0/14AS3356Level 3 Parent, LLCRPKI Not found199.92.0.0
- Registry
- ARIN · United States · Dec 22, 1993
- Delegated block
- 199.92.0.0 – 199.95.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 199.92.160.0/21AS11499Woods Hole Oceanographic InstitutionRPKI Not found199.92.160.0
- 199.92.168.0/23AS11499Woods Hole Oceanographic InstitutionRPKI Not found199.92.168.0
- 199.92.170.0/24AS11499Woods Hole Oceanographic InstitutionRPKI Not found199.92.170.0
- 199.93.81.0/24AS30054The College of WestchesterRPKI Not found199.93.81.0
- 199.93.84.0/24AS54383Norwood Cooperative BankRPKI Not found199.93.84.0
- 199.94.0.0/19AS13315Harvard Business SchoolRPKI Valid199.94.0.0
- 199.94.32.0/20AS13315Harvard Business SchoolRPKI Valid199.94.32.0
- 199.94.48.0/24AS13315Harvard Business SchoolRPKI Valid199.94.48.0
- 199.94.60.0/22AS1742Harvard UniversityRPKI Valid199.94.60.0
- 199.94.64.0/19AS13838Emerson CollegeRPKI Not found199.94.64.0
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.