asn.dev

Observed topology

AS101 WASH-NSF-AS

Unclassified ARIN Educational/Research

Upstreams 17 carry this network
Downstreams 17 this network carries
Adjacent (IPv4) 36
Adjacent (IPv6) 22
Upstream graph Who carries AS101, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS101 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 17

Networks observed carrying traffic for AS101: 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
AS3356Level 3 Parent, LLCTransitIPv4 IPv678
AS6939Hurricane Electric LLCTransitIPv4 IPv672
AS174Cogent Communications, LLCTransitIPv4 IPv668
AS3491PCCW Global (HK) Ltd.TransitIPv412
AS7575Australian Academic and Research Network (AARNet)EducationIPv4 IPv611
AS11164Internet2EducationIPv4 IPv69
AS852TELUS Communications Inc.ResidentialIPv4 IPv66
AS9002RETN LimitedUnclassifiedIPv4 IPv66
AS24482SG.GSHostingIPv4 IPv66
AS394256Tech Futures Interactive Inc.UnclassifiedIPv4 IPv66

All 17 upstreams →

Transit

Downstream networks

All 17

Networks for which AS101 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS10430Washington State K-20 Telecommunications NetworkEducationIPv4 IPv65,783
AS3807University of MontanaEducationIPv4 IPv61,351
AS73University of WashingtonUnclassifiedIPv4 IPv6662
AS13476Montana State UniversityUnclassifiedIPv4 IPv6662
AS4193State of WashingtonUnclassifiedIPv4 IPv6445
AS17200Seattle Community College DistrictUnclassifiedIPv4313
AS14954The Fred Hutchinson Cancer Research CenterUnclassifiedIPv4126
AS11548Heritage UniversityEducationIPv4124
AS54429Local Connectivity LabUnclassifiedIPv4 IPv6113
AS14221University of WashingtonUnclassifiedIPv4 IPv697

All 17 downstreams →

Adjacency

Adjacent networks

All 36

Every AS seen directly next to AS101 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS10430Washington State K-20 Telecommunications NetworkEducationIPv4 IPv68,982
AS3356Level 3 Parent, LLCTransitIPv4 IPv64,036
AS174Cogent Communications, LLCTransitIPv4 IPv63,145
AS6939Hurricane Electric LLCTransitIPv4 IPv61,799
AS3807University of MontanaEducationIPv4 IPv61,351
AS3491PCCW Global (HK) Ltd.TransitIPv4934
AS73University of WashingtonUnclassifiedIPv4 IPv6724
AS13476Montana State UniversityUnclassifiedIPv4 IPv6662
AS11537Internet2UnclassifiedIPv4 IPv6615
AS7575Australian Academic and Research Network (AARNet)EducationIPv4 IPv6600

All 36 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-19 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.17M 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.