asn.dev

Observed topology

AS2500 WIDE-BB - WIDE Project

Unclassified ARIN Educational/Research

Upstreams 9 carry this network
Downstreams 18 this network carries
Adjacent (IPv4) 26
Adjacent (IPv6) 18
Upstream graph Who carries AS2500, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS2500 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS2500: 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
AS2914NTT America, Inc.TransitIPv4 IPv683
AS17676SoftBank Corp.MobileIPv4 IPv657
AS6939Hurricane Electric LLCTransitIPv4 IPv647
AS7660Asia Pacific Advanced Network - JapanUnclassifiedIPv4 IPv619
AS24482SG.GSHostingIPv4 IPv64
AS2497Internet Initiative Japan Inc.UnclassifiedIPv43
AS9002RETN LimitedUnclassifiedIPv43
AS132132MyRepublic Ltd.ResidentialIPv43
AS141682APIDT Infrastructure Pty LtdUnclassifiedIPv43

Transit

Downstream networks

All 18

Networks for which AS2500 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS23799National Defense AcademyUnclassifiedIPv4244
AS63783Chiba University of CommerceUnclassifiedIPv4122
AS4690WIDE ProjectUnclassifiedIPv4 IPv694
AS55384Japan Advanced Institute of Science and TechnologyUnclassifiedIPv4 IPv694
AS141682APIDT Infrastructure Pty LtdUnclassifiedIPv4 IPv688
AS17932Japan Advanced Institute of Science and TechnologyUnclassifiedIPv4 IPv681
AS131158Nara Institute of Science and Technology, National University CorporationUnclassifiedIPv4 IPv642
AS4717WIDE ProjectEducationIPv632
AS2515Japan Network Information CenterUnclassifiedIPv4 IPv625
AS2501The University of TokyoEducationIPv424

All 18 downstreams →

Adjacency

Adjacent networks

All 28

Every AS seen directly next to AS2500 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS17676SoftBank Corp.MobileIPv4 IPv6510
AS23799National Defense AcademyUnclassifiedIPv4244
AS6939Hurricane Electric LLCTransitIPv4 IPv6227
AS2914NTT America, Inc.TransitIPv4 IPv6197
AS7660Asia Pacific Advanced Network - JapanUnclassifiedIPv4 IPv6147
AS63783Chiba University of CommerceUnclassifiedIPv4122
AS141682APIDT Infrastructure Pty LtdUnclassifiedIPv4 IPv698
AS4690WIDE ProjectUnclassifiedIPv4 IPv694
AS55384Japan Advanced Institute of Science and TechnologyUnclassifiedIPv4 IPv694
AS17932Japan Advanced Institute of Science and TechnologyUnclassifiedIPv4 IPv681

All 28 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-01 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.48M 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.