asn.dev

Observed topology

AS20900 AS-IMSNETORKS IMSNETWORKS

Unclassified RIPE Cable/DSL/ISP

Upstreams 7 carry this network
Downstreams 8 this network carries
Adjacent (IPv4) 15
Adjacent (IPv6) 4
Upstream graph Who carries AS20900, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS20900 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS20900: 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
AS3356Level 3 Parent, LLCTransitIPv4 IPv6588
AS174Cogent Communications, LLCTransitIPv4 IPv6438
AS6939Hurricane Electric LLCTransitIPv4192
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6184
AS6696VERIXI SAUnclassifiedIPv424
AS20766Association "Gitoyen"UnclassifiedIPv424
AS24482SG.GSHostingIPv424

Transit

Downstream networks

inferred

Networks for which AS20900 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS50758Airbus Defence and Space SASUnclassifiedIPv4456
AS198340Societe Air France S.A.UnclassifiedIPv4314
AS204509SEINE ET YVELINES NUMERIQUEUnclassifiedIPv4289
AS204516CAPLASER SAUnclassifiedIPv4114
AS204212La Lyre du G3UnclassifiedIPv4 IPv691
AS204835Caisse Nationale des Allocations Familiales (CNAF)UnclassifiedIPv491
AS47233OYA ENERGIES SCICUnclassifiedIPv457
AS209483BPCE S.A.UnclassifiedIPv457

Adjacency

Adjacent networks

All 15

Every AS seen directly next to AS20900 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,135
AS174Cogent Communications, LLCTransitIPv4 IPv6913
AS50758Airbus Defence and Space SASUnclassifiedIPv4456
AS6939Hurricane Electric LLCTransitIPv4402
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6348
AS198340Societe Air France S.A.UnclassifiedIPv4314
AS204509SEINE ET YVELINES NUMERIQUEUnclassifiedIPv4289
AS204516CAPLASER SAUnclassifiedIPv4114
AS204212La Lyre du G3UnclassifiedIPv4 IPv691
AS204835Caisse Nationale des Allocations Familiales (CNAF)UnclassifiedIPv491

All 15 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-21 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.14M 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.