BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
84.53.128.0/18
Announced exactly
- 84.53.128.0/18AS20940Akamai International B.V.RPKI Valid84.53.128.0
- Registry
- RIPE NCC · Netherlands · Nov 5, 2004
- Delegated block
- 84.53.128.0 – 84.53.191.255
Covering routes
No less-specific route covers it.
More-specific routes
- 84.53.132.0/23AS20940Akamai International B.V.RPKI Valid84.53.132.0
- 84.53.139.0/24AS21342Akamai International B.V.RPKI Valid84.53.139.0
- 84.53.156.0/22AS16625Akamai Technologies, Inc.RPKI Valid84.53.156.0
- 84.53.164.0/22AS16625Akamai Technologies, Inc.RPKI Valid84.53.164.0
- 84.53.172.0/24AS20940Akamai International B.V.RPKI Valid84.53.172.0
- 84.53.175.0/24AS20940Akamai International B.V.RPKI Valid84.53.175.0
- 84.53.176.0/24AS34164Akamai International B.V.RPKI Valid84.53.176.0
- 84.53.184.0/24AS12874Fastweb SpARPKI Valid84.53.184.0
- 84.53.186.0/24AS34164Akamai International B.V.RPKI Valid84.53.186.0
- 84.53.188.0/22AS16625Akamai Technologies, Inc.RPKI Valid84.53.188.0
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.