Upstream networks
AS103 NWU-AS
Unclassified ARIN
Transit
Upstream networks
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.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS2381 | WiscNet | Unclassified | IPv4 IPv6 | 943 |
| AS174 | Cogent Communications, LLC | Transit | IPv4 | 159 |
| AS3356 | Level 3 Parent, LLC | Transit | IPv4 IPv6 | 154 |
| AS22335 | Metropolitan Research and Education Network | Unclassified | IPv4 IPv6 | 144 |
| AS33491 | Comcast Cable Communications, LLC | Unclassified | IPv4 | 107 |
| AS293 | ESnet | Unclassified | IPv4 | 22 |
| AS11537 | Internet2 | Unclassified | IPv4 | 15 |
| AS11164 | Internet2 | Education | IPv4 | 6 |
| AS396450 | Internet2 | Unclassified | IPv4 | 5 |
| AS149433 | FM Networks | Unclassified | IPv6 | 4 |
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.
Derived from routing tables collected at 2026-10-31 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.50M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.