BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
2001:3c8::/32
Announced exactly
- 2001:3c8::/32AS4621UNINET-THRPKI Valid2001:3c8::
- Registry
- APNIC · Thailand · May 13, 2002
- Delegated block
- 2001:3c8:: – 2001:3c8:1fff:ffff:ffff:ffff:ffff:ffff
Covering routes
No less-specific route covers it.
More-specific routes
- 2001:3c8:243::/48AS138685Mahidol Wittayanusorn SchoolRPKI Valid2001:3c8:243::
- 2001:3c8:100f::/48AS133919University campus network, Rajamangala University of Technology Phra NakhonRPKI Valid2001:3c8:100f::
- 2001:3c8:10ff::/48AS139657University of the Thai Chamber of CommerceRPKI Invalid2001:3c8:10ff::
- 2001:3c8:1202::/48AS4762Mahidol University, ThailandRPKI Valid2001:3c8:1202::
- 2001:3c8:1303::/48AS9411Kasetsart University, ThailandRPKI Valid2001:3c8:1303::
- 2001:3c8:1306::/48AS137198Phranakorn Rajabhat UniversityRPKI Valid2001:3c8:1306::
- 2001:3c8:130a::/48AS17827Sukhothai Thammathirat Open UniversityRPKI Valid2001:3c8:130a::
- 2001:3c8:1401::/48AS3839Chulalongkorn UniversityRPKI Valid2001:3c8:1401::
- 2001:3c8:1408::/48AS137261Education NetworkRPKI Valid2001:3c8:1408::
- 2001:3c8:1606::/48AS4762Mahidol University, ThailandRPKI Valid2001:3c8:1606::
- 2001:3c8:2707::/48AS4762Mahidol University, ThailandRPKI Valid2001:3c8:2707::
- 2001:3c8:4007::/48AS137241PibulSongkramRajabhat UniversityRPKI Valid2001:3c8:4007::
- 2001:3c8:5007::/48AS17479Chiang Mai UniversityRPKI Valid2001:3c8:5007::
- 2001:3c8:5505::/48AS137850Mae Fah Luang UniversityRPKI Valid2001:3c8:5505::
- 2001:3c8:9006::/48AS135616Name: Thaksin UniversityRPKI Valid2001:3c8:9006::
- 2001:3c8:9009::/48AS9464Prince of Songkla University (Sritrang'NET)RPKI Valid2001:3c8:9009::
- 2001:3c8:900c::/48AS45575Rajamangala University of Technology SrivijayaRPKI Valid2001:3c8:900c::
- 2001:3c8:a701::/48AS9562Mahasarakham UniversityRPKI Valid2001:3c8:a701::
- 2001:3c8:a702::/48AS132879Rajabhat Mahasarakham UniversityRPKI Valid2001:3c8:a702::
- 2001:3c8:c301::/48AS55545Suranaree University of TechnologyRPKI Valid2001:3c8:c301::
- 2001:3c8:c305::/48AS37932Rajamangala University of Technology IsanRPKI Valid2001:3c8:c305::
- 2001:3c8:cb01::/48AS136624Sakon Nakhon Rajabhat UniversityRPKI Valid2001:3c8:cb01::
- 2001:3c8:e10e::/48AS137546Faculty of Engineering , Rajamangala University ofRPKI Valid2001:3c8:e10e::
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.