BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
206.31.0.0/16
Announced exactly
- 206.31.0.0/16AS3561CenturyLink Communications, LLCRPKI Not found206.31.0.0
- Registry
- ARIN · United States · May 24, 1995
- Delegated block
- 206.30.0.0 – 206.31.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 206.31.0.0/19AS3561CenturyLink Communications, LLCRPKI Not found206.31.0.0
- 206.31.16.0/24AS10584TradeWeb, LLCRPKI Not found206.31.16.0
- 206.31.32.0/19AS3561CenturyLink Communications, LLCRPKI Not found206.31.32.0
- 206.31.50.0/23AS19950CB Neptune Holdings, LLCRPKI Not found206.31.50.0
- 206.31.64.0/21AS3561CenturyLink Communications, LLCRPKI Not found206.31.64.0
- 206.31.176.0/24AS27680TELEFONICA MOVIL DE CHILE S.A.RPKI Not found206.31.176.0
- 206.31.177.0/24AS27680TELEFONICA MOVIL DE CHILE S.A.RPKI Not found206.31.177.0
- 206.31.228.0/24AS3561CenturyLink Communications, LLCRPKI Not found206.31.228.0
- 206.31.229.0/24AS3561CenturyLink Communications, LLCRPKI Not found206.31.229.0
- 206.31.232.0/24AS3561CenturyLink Communications, LLCRPKI Not found206.31.232.0
- 206.31.233.0/24AS3561CenturyLink Communications, LLCRPKI Not found206.31.233.0
- 206.31.240.0/20AS3561CenturyLink Communications, LLCRPKI Not found206.31.240.0
- 206.31.242.0/24AS26527LightWave NetworksRPKI Not found206.31.242.0
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.