BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
82.41.128.0/20
Announced exactly
- 82.41.128.0/20AS18046DONGFONG-TW DongFong Technology Co. Ltd.RPKI Not found82.41.128.0
- Registry
- RIPE NCC · United Kingdom · Jan 31, 2003
- Delegated block
- 82.40.0.0 – 82.41.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 82.41.130.0/24AS21859Zenlayer IncRPKI Valid82.41.130.0
- 82.41.131.0/24AS49981WORLDSTREAMRPKI Valid82.41.131.0
- 82.41.132.0/24AS23470ReliableSite.Net LLCRPKI Valid82.41.132.0
- 82.41.133.0/24AS213169CATIXS-EDGERPKI Valid82.41.133.0
- 82.41.134.0/24AS16276OVHRPKI Valid82.41.134.0
- 82.41.135.0/24AS834IPXO LLCRPKI Valid82.41.135.0
- 82.41.137.0/24AS208226OUIHEBERGRPKI Valid82.41.137.0
- 82.41.139.0/24AS9304HUTCHISON-AS-AP HGC Global Communications LimitedRPKI Valid82.41.139.0
- 82.41.140.0/24AS213476LITLINKRPKI Valid82.41.140.0
- 82.41.141.0/24AS42831UKSERVERS-AS UK Dedicated Servers, Hosting and Co-LocationRPKI Valid82.41.141.0
- 82.41.142.0/24AS37191Raya-HoldingRPKI Valid82.41.142.0
- 82.41.143.0/24AS3320DTAG Internet service provider operationsRPKI Valid82.41.143.0
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.