asn.dev

Observed topology

AS40387 UI-ICCN

Unclassified ARIN Educational/Research

Upstreams 6 carry this network
Downstreams 7 this network carries
Adjacent (IPv4) 14
Adjacent (IPv6) 9
Upstream graph Who carries AS40387, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS40387 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS40387: 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
AS23473PAVLOV MEDIA INCUnclassifiedIPv4 IPv669
AS1299Arelion Sweden ABTransitIPv4 IPv623
AS11164Internet2EducationIPv4 IPv65
AS11537Internet2UnclassifiedIPv44
AS2381WiscNetUnclassifiedIPv4 IPv62
AS293ESnetUnclassifiedIPv41

Transit

Downstream networks

inferred

Networks for which AS40387 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS38University of IllinoisUnclassifiedIPv4 IPv6380
AS6200University of Illinois ChicagoEducationIPv4379
AS698University of IllinoisUnclassifiedIPv4 IPv6172
AS14834University of Illinois at SpringfieldUnclassifiedIPv4 IPv6172
AS1224University of IllinoisUnclassifiedIPv4 IPv6155
AS32464University Of Illinois College Of Medicine At PeoriaUnclassifiedIPv466
AS26367Bradley UniversityUnclassifiedIPv45

Adjacency

Adjacent networks

All 14

Every AS seen directly next to AS40387 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS23473PAVLOV MEDIA INCUnclassifiedIPv4 IPv6745
AS1299Arelion Sweden ABTransitIPv4 IPv6386
AS38University of IllinoisUnclassifiedIPv4 IPv6380
AS6200University of Illinois ChicagoEducationIPv4379
AS2381WiscNetUnclassifiedIPv4 IPv6174
AS698University of IllinoisUnclassifiedIPv4 IPv6172
AS14834University of Illinois at SpringfieldUnclassifiedIPv4 IPv6172
AS1224University of IllinoisUnclassifiedIPv4 IPv6155
AS32464University Of Illinois College Of Medicine At PeoriaUnclassifiedIPv466
AS11537Internet2UnclassifiedIPv4 IPv657

All 14 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-21 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.14M 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.