BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
211.241.0.0/17
Announced exactly
- 211.241.0.0/17AS9316DACOM-PUBNETPLUSRPKI Not found211.241.0.0
- Registry
- APNIC · South Korea · Sep 8, 2000
- Delegated block
- 211.241.0.0 – 211.241.127.255
Covering routes
No less-specific route covers it.
More-specific routes
- 211.241.3.0/24AS9647Seoul Metropolitan GovernmentRPKI Not found211.241.3.0
- 211.241.8.0/24AS23568CycleBoat Racing Business DivisionRPKI Not found211.241.8.0
- 211.241.9.0/24AS3608Korea Rural Community CorporationRPKI Not found211.241.9.0
- 211.241.10.0/23AS3608Korea Rural Community CorporationRPKI Not found211.241.10.0
- 211.241.12.0/22AS3608Korea Rural Community CorporationRPKI Not found211.241.12.0
- 211.241.24.0/24AS18027Namseoul universityRPKI Not found211.241.24.0
- 211.241.26.0/23AS18027Namseoul universityRPKI Not found211.241.26.0
- 211.241.36.0/23AS9647Seoul Metropolitan GovernmentRPKI Not found211.241.36.0
- 211.241.37.0/24AS9647Seoul Metropolitan GovernmentRPKI Not found211.241.37.0
- 211.241.52.0/22AS18027Namseoul universityRPKI Not found211.241.52.0
- 211.241.52.0/23AS18027Namseoul universityRPKI Not found211.241.52.0
- 211.241.54.0/23AS18027Namseoul universityRPKI Not found211.241.54.0
- 211.241.56.0/21AS18027Namseoul universityRPKI Not found211.241.56.0
- 211.241.56.0/22AS18027Namseoul universityRPKI Not found211.241.56.0
- 211.241.60.0/22AS18027Namseoul universityRPKI Not found211.241.60.0
- 211.241.60.0/24AS18027Namseoul universityRPKI Not found211.241.60.0
- 211.241.61.0/24AS18027Namseoul universityRPKI Not found211.241.61.0
- 211.241.64.0/24AS3608Korea Rural Community CorporationRPKI Not found211.241.64.0
- 211.241.67.0/24AS7626SCOURTFAMILYRPKI Not found211.241.67.0
- 211.241.72.0/22AS3608Korea Rural Community CorporationRPKI Not found211.241.72.0
- 211.241.76.0/24AS4766Korea TelecomRPKI Not found211.241.76.0
- 211.241.77.0/24AS4766Korea TelecomRPKI Not found211.241.77.0
- 211.241.78.0/24AS4766Korea TelecomRPKI Not found211.241.78.0
- 211.241.80.0/24AS3608Korea Rural Community CorporationRPKI Not found211.241.80.0
- 211.241.91.0/24AS10161QIARPKI Not found211.241.91.0
- 211.241.94.0/24AS3608Korea Rural Community CorporationRPKI Not found211.241.94.0
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.