asn.dev

Observed topology

AS103 NWU-AS

Unclassified ARIN

Upstreams 10 carry this network
Downstreams 0 this network carries
Adjacent (IPv4) 9
Adjacent (IPv6) 4
Upstream graph Who carries AS103, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS103 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS103: 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
AS2381WiscNetUnclassifiedIPv4 IPv6944
AS174Cogent Communications, LLCTransitIPv4159
AS3356Level 3 Parent, LLCTransitIPv4 IPv6153
AS22335Metropolitan Research and Education NetworkUnclassifiedIPv4 IPv6144
AS33491Comcast Cable Communications, LLCUnclassifiedIPv4107
AS293ESnetUnclassifiedIPv422
AS11537Internet2UnclassifiedIPv415
AS11164Internet2EducationIPv46
AS396450Internet2UnclassifiedIPv45
AS149433FM NetworksUnclassifiedIPv64

Transit

Downstream networks

inferred

Networks for which AS103 was observed as the last hop before the origin, meaning it appears to provide them transit.

No downstream observed. This network does not appear to carry transit for anyone.

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS103 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS2381WiscNetUnclassifiedIPv4 IPv6944
AS174Cogent Communications, LLCTransitIPv4159
AS3356Level 3 Parent, LLCTransitIPv4 IPv6153
AS22335Metropolitan Research and Education NetworkUnclassifiedIPv4 IPv6144
AS33491Comcast Cable Communications, LLCUnclassifiedIPv4107
AS293ESnetUnclassifiedIPv422
AS11537Internet2UnclassifiedIPv415
AS11164Internet2EducationIPv46
AS396450Internet2UnclassifiedIPv45
AS149433FM NetworksUnclassifiedIPv64

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-30 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.49M 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.