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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:

211.35.0.0/18

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

Announced exactly

Registry
APNIC · South Korea · Aug 27, 1999
Delegated block
211.35.0.0 – 211.35.63.255

Covering routes

0

No less-specific route covers it.

More-specific routes

35 more-specifics from 4 origin AS(es)
  • 211.35.2.0/24AS38681Jeollanamdo Educational Research Information InstituteRPKI Not found211.35.2.0
  • 211.35.3.0/24AS38681Jeollanamdo Educational Research Information InstituteRPKI Not found211.35.3.0
  • 211.35.4.0/24AS38681Jeollanamdo Educational Research Information InstituteRPKI Not found211.35.4.0
  • 211.35.5.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.5.0
  • 211.35.6.0/24AS38681Jeollanamdo Educational Research Information InstituteRPKI Not found211.35.6.0
  • 211.35.8.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.8.0
  • 211.35.9.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.9.0
  • 211.35.11.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.11.0
  • 211.35.12.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.12.0
  • 211.35.13.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.13.0
  • 211.35.14.0/24AS4766Korea TelecomRPKI Not found211.35.14.0
  • 211.35.15.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.15.0
  • 211.35.16.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.16.0
  • 211.35.19.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.19.0
  • 211.35.21.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.21.0
  • 211.35.23.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.23.0
  • 211.35.25.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.25.0
  • 211.35.26.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.26.0
  • 211.35.27.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.27.0
  • 211.35.29.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.29.0
  • 211.35.31.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.31.0
  • 211.35.36.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.36.0
  • 211.35.38.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.38.0
  • 211.35.40.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.40.0
  • 211.35.41.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.41.0
  • 211.35.43.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.43.0
  • 211.35.44.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.44.0
  • 211.35.45.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.45.0
  • 211.35.48.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.48.0
  • 211.35.49.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.49.0
  • 211.35.56.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.56.0
  • 211.35.57.0/24AS9647Seoul Metropolitan GovernmentRPKI Not found211.35.57.0
  • 211.35.61.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.61.0
  • 211.35.62.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.62.0
  • 211.35.63.0/24AS9528Chungcheongbuk-do Education Research and Information InstituteRPKI Not found211.35.63.0

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.

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