BGP Prefix Lookup
Enter a prefix (or a single address). Answered from our daily copy of the global routing table.
65.51.128.0/17
Announced exactly
- 65.51.128.0/17AS54004Cablevision Lightpath LLCRPKI Valid65.51.128.0
- Registry
- ARIN · United States · Nov 5, 2007
- Delegated block
- 65.51.0.0 – 65.51.255.255
Covering routes
No less-specific route covers it.
More-specific routes
- 65.51.128.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.128.0
- 65.51.129.0/24AS399208SL Green Realty CorpRPKI Valid65.51.129.0
- 65.51.133.0/24AS398116FDNYRPKI Valid65.51.133.0
- 65.51.134.0/24AS46673UNASSIGNEDRPKI Valid65.51.134.0
- 65.51.136.0/24AS54004Cablevision Lightpath LLCRPKI Valid65.51.136.0
- 65.51.144.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.144.0
- 65.51.144.0/24AS396242Tiffany and CompanyRPKI Valid65.51.144.0
- 65.51.152.0/24AS13938SS&C Technologies, Inc.RPKI Valid65.51.152.0
- 65.51.153.0/24AS13938SS&C Technologies, Inc.RPKI Valid65.51.153.0
- 65.51.160.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.160.0
- 65.51.168.0/24AS12216KRAVET INC.RPKI Valid65.51.168.0
- 65.51.172.0/24AS62642Bigleaf Networks, Inc.RPKI Valid65.51.172.0
- 65.51.173.0/24AS400836SL Green Realty CorpRPKI Valid65.51.173.0
- 65.51.176.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.176.0
- 65.51.192.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.192.0
- 65.51.194.0/24AS54004Cablevision Lightpath LLCRPKI Valid65.51.194.0
- 65.51.200.0/24AS46835Centrastate Medical Center, Inc.RPKI Valid65.51.200.0
- 65.51.201.0/24AS14699UNASSIGNEDRPKI Valid65.51.201.0
- 65.51.203.0/24AS46904Weitz & Luxenberg P.CRPKI Valid65.51.203.0
- 65.51.208.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.208.0
- 65.51.208.0/24AS46870New Jersey ResourcesRPKI Valid65.51.208.0
- 65.51.218.0/24AS397394Gold Coast BroadbandRPKI Valid65.51.218.0
- 65.51.219.0/24AS397394Gold Coast BroadbandRPKI Valid65.51.219.0
- 65.51.222.0/24AS32787Akamai Technologies, Inc.RPKI Valid65.51.222.0
- 65.51.224.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.224.0
- 65.51.231.0/24AS399684SL Green Realty CorpRPKI Valid65.51.231.0
- 65.51.240.0/20AS54004Cablevision Lightpath LLCRPKI Valid65.51.240.0
- 65.51.242.0/24AS19862Bridgehampton National BankRPKI Valid65.51.242.0
- 65.51.247.0/24AS398116FDNYRPKI Valid65.51.247.0
- 65.51.249.0/24AS40137AWM Investment Company, Inc.RPKI Valid65.51.249.0
- 65.51.251.0/24AS22345Solix, Inc.RPKI Valid65.51.251.0
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.