asn.dev

Observed topology

AS21723 GOCO

Residential ARIN

Upstreams 13 carry this network
Downstreams 3 this network carries
Adjacent (IPv4) 18
Adjacent (IPv6) 7
Upstream graph Who carries AS21723, and who carries them, drawn as a map up to the transit-free core. 5 exchanges Where AS21723 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 13

Networks observed carrying traffic for AS21723: 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
AS577Bell CanadaMobileIPv4 IPv61,623
AS812Rogers Communications Canada Inc.MobileIPv4 IPv61,481
AS6939Hurricane Electric LLCTransitIPv41,208
AS3356Level 3 Parent, LLCTransitIPv41,193
AS3257GTT Communications Inc.TransitIPv41,090
AS174Cogent Communications, LLCTransitIPv4 IPv6787
AS852TELUS Communications Inc.ResidentialIPv4 IPv6693
AS6327Shaw CommunicationsResidentialIPv4361
AS1403EBOXResidentialIPv4 IPv6312
AS22652Videotron LteeResidentialIPv4 IPv6274

All 13 upstreams →

Transit

Downstream networks

inferred

Networks for which AS21723 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS21724GOCO TECHNOLOGY LIMITED PARTNERSHIPUnclassifiedIPv42,672
AS396313MocTelUnclassifiedIPv4165
AS4200633060AS4200633060UnclassifiedIPv44

Adjacency

Adjacent networks

All 18

Every AS seen directly next to AS21723 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS21724GOCO TECHNOLOGY LIMITED PARTNERSHIPUnclassifiedIPv42,672
AS6939Hurricane Electric LLCTransitIPv41,876
AS812Rogers Communications Canada Inc.MobileIPv4 IPv61,846
AS577Bell CanadaMobileIPv4 IPv61,731
AS3257GTT Communications Inc.TransitIPv41,680
AS3356Level 3 Parent, LLCTransitIPv41,673
AS852TELUS Communications Inc.ResidentialIPv4 IPv6910
AS174Cogent Communications, LLCTransitIPv4 IPv6875
AS22652Videotron LteeResidentialIPv4 IPv6400
AS1403EBOXResidentialIPv4 IPv6372

All 18 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-29 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.36M 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.