asn.dev

Observed topology

AS1237 KREONET-AS-KR-KR - KISTI

Unclassified ARIN Educational/Research

Upstreams 3 carry this network
Downstreams 42 this network carries
Adjacent (IPv4) 44
Adjacent (IPv6) 4
Upstream graph Who carries AS1237, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS1237 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS1237: the AS immediately before it in a routing path. Ranked by how many paths showed the relationship, which reflects how widely it is used, not how much traffic crosses it.

ASNetworkTypeFamiliesPaths seen
AS17579KISTIEducationIPv4 IPv610,778
AS4766Korea TelecomMobileIPv4 IPv62,572
AS399861Mobite Network LLCUnclassifiedIPv4780

Transit

Downstream networks

All 42

Networks for which AS1237 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS18297K-JISTUnclassifiedIPv41,809
AS7564Korea Atomic Energy Research InstituteUnclassifiedIPv41,632
AS131795KOREA INSTITUTE OF ENERGY RESEARCHUnclassifiedIPv4884
AS9317INHA UNIVERSITYEducationIPv4868
AS9949Hoseo UniversityEducationIPv4729
AS10052Kyungpook National UniversityEducationIPv4691
AS9488Seoul National UniversityEducationIPv4643
AS2385KRIBB(Korea Research Institute of Bioscience Biotechnology)UnclassifiedIPv4612
AS24026KOREA INSTITUTE OF FUSION ENERGYUnclassifiedIPv4612
AS17595Korea Institute of Nuclear SafetyUnclassifiedIPv4536

All 42 downstreams →

Adjacency

Adjacent networks

All 44

Every AS seen directly next to AS1237 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS17579KISTIEducationIPv4 IPv622,063
AS4766Korea TelecomMobileIPv4 IPv66,382
AS18297K-JISTUnclassifiedIPv41,809
AS7564Korea Atomic Energy Research InstituteUnclassifiedIPv41,632
AS131795KOREA INSTITUTE OF ENERGY RESEARCHUnclassifiedIPv4884
AS9317INHA UNIVERSITYEducationIPv4868
AS399861Mobite Network LLCUnclassifiedIPv4780
AS9949Hoseo UniversityEducationIPv4729
AS10052Kyungpook National UniversityEducationIPv4691
AS9488Seoul National UniversityEducationIPv4643

All 44 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-05 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 73.57M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.

Inferred from path position, not from any declaration by either party. A network appearing here is carrying these routes; whether that is a paid transit arrangement, a backup, or something else is not something routing data can tell you. Adjacency is not the same as peering. Being next to each other in a path covers paid transit, settlement-free peering and customer connections alike, and routing data cannot distinguish them. Treat this as "these networks exchange routes", nothing more specific.

Cross-check against RIPEstat or BGP.tools, which observe from a different and larger set of vantage points.