BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
2404:4a00::/32
Announced exactly
- 2404:4a00::/32AS45629JasTel Network International GatewayRPKI Valid2404:4a00::
- Registry
- APNIC · Thailand · Sep 2, 2010
- Delegated block
- 2404:4a00:: – 2404:4a00:ffff:ffff:ffff:ffff:ffff:ffff
Covering routes
No less-specific route covers it.
More-specific routes
- 2404:4a00:a::/48AS55423JasTel NetworkRPKI Valid2404:4a00:a::
- 2404:4a00:b::/48AS55423JasTel NetworkRPKI Valid2404:4a00:b::
- 2404:4a00:d::/48AS55423JasTel NetworkRPKI Valid2404:4a00:d::
- 2404:4a00:1000::/48AS55423JasTel NetworkRPKI Valid2404:4a00:1000::
- 2404:4a00:2094::/48AS55423JasTel NetworkRPKI Valid2404:4a00:2094::
- 2404:4a00:3293::/48AS45629JasTel Network International GatewayRPKI Valid2404:4a00:3293::
- 2404:4a00:5542::/48AS55423JasTel NetworkRPKI Valid2404:4a00:5542::
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.