Upstream networks
AS5400 BT
Unclassified RIPE
Transit
Upstream networks
Networks observed carrying traffic for AS5400: 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 |
|---|---|---|---|---|
| AS1299 | Arelion Sweden AB | Transit | IPv4 IPv6 | 1,144 |
| AS6939 | Hurricane Electric LLC | Transit | IPv4 IPv6 | 1,010 |
| AS3356 | Level 3 Parent, LLC | Transit | IPv4 IPv6 | 774 |
| AS174 | Cogent Communications, LLC | Transit | IPv4 IPv6 | 541 |
| AS9002 | RETN Limited | Unclassified | IPv4 IPv6 | 450 |
| AS3257 | GTT Communications Inc. | Transit | IPv4 IPv6 | 282 |
| AS577 | Bell Canada | Mobile | IPv4 IPv6 | 242 |
| AS3491 | PCCW Global (HK) Ltd. | Transit | IPv4 IPv6 | 169 |
| AS4637 | Telstra Global | Unclassified | IPv4 IPv6 | 143 |
| AS6762 | TELECOM ITALIA SPARKLE S.p.A. | Transit | IPv4 IPv6 | 126 |
| AS42708 | Glesys AB | Unclassified | IPv4 IPv6 | 125 |
| AS50304 | Blix Solutions AS | Unclassified | IPv4 IPv6 | 125 |
| AS3333 | Reseaux IP Europeens Network Coordination Centre (RIPE NCC) | Unclassified | IPv4 IPv6 | 124 |
| AS1836 | green.ch AG | Residential | IPv4 IPv6 | 121 |
| AS6453 | TATA COMMUNICATIONS (AMERICA) INC | Transit | IPv4 IPv6 | 107 |
| AS2914 | NTT America, Inc. | Transit | IPv4 IPv6 | 93 |
| AS2497 | Internet Initiative Japan Inc. | Unclassified | IPv4 | 85 |
| AS3303 | Swisscom (Schweiz) AG | Residential | IPv4 | 85 |
| AS11164 | Internet2 | Education | IPv4 | 85 |
| AS12552 | GlobalConnect AB | Unclassified | IPv4 | 85 |
| AS20485 | Joint Stock Company TransTeleCom | Unclassified | IPv4 | 85 |
| AS33891 | Core-Backbone GmbH | Hosting | IPv4 | 85 |
| AS37100 | SEACOM Limited | Unclassified | IPv4 | 85 |
| AS6830 | Liberty Global Europe Holding B.V. | Residential | IPv4 | 52 |
| AS13030 | Init7 (Switzerland) Ltd. | Hosting | IPv6 | 39 |
| AS7195 | EDGEUNO S.A.S | Unclassified | IPv4 IPv6 | 25 |
| AS1273 | IDDQD-AS | Business | IPv4 | 2 |
| AS5511 | Orange S.A. | Transit | IPv4 | 2 |
| AS1257 | Tele2 Sverige AB | Mobile | IPv4 | 1 |
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 2026-10-14 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.25M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.