asn.dev

Observed topology

AS21351 CANALPLUSTELECOM Canal + Telecom SAS

Mobile ARIN Cable/DSL/ISP

Upstreams 22 carry this network
Downstreams 10 this network carries
Adjacent (IPv4) 29
Adjacent (IPv6) 23
Upstream graph Who carries AS21351, and who carries them, drawn as a map up to the transit-free core. 8 exchanges Where AS21351 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 22

Networks observed carrying traffic for AS21351: 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
AS1299Arelion Sweden ABTransitIPv4 IPv6546
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6405
AS2914NTT America, Inc.TransitIPv4 IPv6294
AS30844Liquid Telecommunications LtdUnclassifiedIPv4 IPv6172
AS12956TELEFONICA GLOBAL SOLUTIONS SLTransitIPv4 IPv6136
AS6939Hurricane Electric LLCTransitIPv4 IPv6130
AS4788TM TECHNOLOGY SERVICES SDN. BHD.MobileIPv4 IPv696
AS24482SG.GSHostingIPv4 IPv639
AS3303Swisscom (Schweiz) AGResidentialIPv4 IPv635
AS50628Leonix Telecom SASUnclassifiedIPv4 IPv631

All 22 upstreams →

Transit

Downstream networks

inferred

Networks for which AS21351 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS2470RenaterEducationIPv4 IPv61,318
AS2471RenaterUnclassifiedIPv4930
AS2199RenaterUnclassifiedIPv4 IPv6776
AS2472RenaterUnclassifiedIPv4 IPv6652
AS2088RenaterUnclassifiedIPv4 IPv6217
AS60046Collectivite Territoriale de MartiniqueUnclassifiedIPv4164
AS394485SOLUTECH.NETUnclassifiedIPv4 IPv6152
AS204818Hosteur SASUnclassifiedIPv4120
AS886COLLECTIVITE DE SAINT BARTHELEMYUnclassifiedIPv4 IPv660
AS396950COLLECTIVITE DE SAINT BARTHELEMYUnclassifiedIPv4 IPv623

Adjacency

Adjacent networks

All 34

Every AS seen directly next to AS21351 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv4 IPv62,260
AS2914NTT America, Inc.TransitIPv4 IPv61,349
AS2470RenaterEducationIPv4 IPv61,318
AS2471RenaterUnclassifiedIPv4930
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6907
AS2199RenaterUnclassifiedIPv4 IPv6776
AS2472RenaterUnclassifiedIPv4 IPv6652
AS30844Liquid Telecommunications LtdUnclassifiedIPv4 IPv6599
AS6939Hurricane Electric LLCTransitIPv4 IPv6324
AS2088RenaterUnclassifiedIPv4 IPv6217

All 34 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-03 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.45M 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.