Upstream networks
AS27580 ENGINEERING-ASN1
Unclassified ARIN
Transit
Upstream networks
Networks observed carrying traffic for AS27580: 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 |
|---|---|---|---|---|
| AS33652 | Comcast Cable Communications, LLC | Unclassified | IPv4 IPv6 | 94 |
| AS33667 | Comcast Cable Communications, LLC | Unclassified | IPv4 IPv6 | 86 |
| AS35985 | One Ring Networks, Inc. | Residential | IPv4 IPv6 | 40 |
| AS33651 | Comcast Cable Communications, LLC | Unclassified | IPv4 | 29 |
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 2026-10-17 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.18M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.