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BGP Prefix Lookup

Enter a prefix (or a single address). Answered from our daily copy of the global routing table.

Examples:

211.42.0.0/17

One collector's view (APNIC). A route filtered before it reaches that collector is not listed.

Announced exactly

Registry
APNIC · South Korea · Nov 18, 1999
Delegated block
211.42.0.0 – 211.42.127.255

Covering routes

0

No less-specific route covers it.

More-specific routes

43 more-specifics from 9 origin AS(es)
  • 211.42.0.0/21AS17586NARATV-AS-KR LG HelloVision Corp.RPKI Not found211.42.0.0
  • 211.42.8.0/24AS9698YOUNGDOONG-AS-KR LG HelloVision Corp.RPKI Not found211.42.8.0
  • 211.42.9.0/24AS9698YOUNGDOONG-AS-KR LG HelloVision Corp.RPKI Not found211.42.9.0
  • 211.42.10.0/24AS9698YOUNGDOONG-AS-KR LG HelloVision Corp.RPKI Not found211.42.10.0
  • 211.42.11.0/24AS9698YOUNGDOONG-AS-KR LG HelloVision Corp.RPKI Not found211.42.11.0
  • 211.42.12.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.12.0
  • 211.42.14.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.14.0
  • 211.42.16.0/24AS9647SEOULMETRO-AS Seoul Metropolitan GovernmentRPKI Not found211.42.16.0
  • 211.42.20.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.20.0
  • 211.42.21.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.21.0
  • 211.42.22.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.22.0
  • 211.42.24.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.24.0
  • 211.42.25.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.25.0
  • 211.42.27.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.27.0
  • 211.42.28.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.28.0
  • 211.42.29.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.29.0
  • 211.42.30.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.30.0
  • 211.42.31.0/24AS17590KGPC-AS-KR KOCCARPKI Not found211.42.31.0
  • 211.42.44.0/24AS9950PUBNETPLUS2-AS-KR DACOM-PUBNETPLUSRPKI Not found211.42.44.0
  • 211.42.45.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.45.0
  • 211.42.46.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.46.0
  • 211.42.47.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.47.0
  • 211.42.48.0/24AS18027NSU-AS-KR Namseoul universityRPKI Not found211.42.48.0
  • 211.42.49.0/24AS18027NSU-AS-KR Namseoul universityRPKI Not found211.42.49.0
  • 211.42.51.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.51.0
  • 211.42.52.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.52.0
  • 211.42.53.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.53.0
  • 211.42.58.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.58.0
  • 211.42.59.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.59.0
  • 211.42.61.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.61.0
  • 211.42.62.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.62.0
  • 211.42.63.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.63.0
  • 211.42.65.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.65.0
  • 211.42.66.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.66.0
  • 211.42.67.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.67.0
  • 211.42.68.0/24AS9528CBE-AS-KR Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.42.68.0
  • 211.42.72.0/22AS17841NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICERPKI Not found211.42.72.0
  • 211.42.84.0/23AS17841NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICERPKI Not found211.42.84.0
  • 211.42.86.0/24AS17841NCIA-AS-KR NATIONAL INFORMATION RESOURCES SERVICERPKI Not found211.42.86.0
  • 211.42.92.0/24AS9647SEOULMETRO-AS Seoul Metropolitan GovernmentRPKI Not found211.42.92.0
  • 211.42.94.0/24AS9647SEOULMETRO-AS Seoul Metropolitan GovernmentRPKI Not found211.42.94.0
  • 211.42.100.0/24AS45990HIRANET-AS-KR Health Insurance Review Assessment ServiceRPKI Not found211.42.100.0
  • 211.42.104.0/24AS18027NSU-AS-KR Namseoul universityRPKI Not found211.42.104.0

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.

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