Upstream networks
AS15391 SYSCL1
Hosting RIPE
Transit
Upstream networks
Networks observed carrying traffic for AS15391: 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 |
|---|---|---|---|---|
| AS12912 | T-Mobile Polska S.A. | Unclassified | IPv4 IPv6 | 402 |
| AS31242 | P4 Sp. z o.o. | Mobile | IPv4 IPv6 | 188 |
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 2026-10-19 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.