asn.dev

Observed topology

AS21804 ACCESS-SK - Access Communications Co-operative Limited

Unclassified ARIN

Upstreams 16 carry this network
Downstreams 3 this network carries
Adjacent (IPv4) 17
Adjacent (IPv6) 12
Upstream graph Who carries AS21804, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS21804 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 16

Networks observed carrying traffic for AS21804: 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
AS3257GTT Communications Inc.TransitIPv4 IPv6615
AS6939Hurricane Electric LLCTransitIPv4 IPv6212
AS6327Shaw CommunicationsResidentialIPv4 IPv6183
AS174Cogent Communications, LLCTransitIPv4168
AS9002RETN LimitedUnclassifiedIPv4 IPv674
AS1403EBOXResidentialIPv4 IPv652
AS22652Videotron LteeResidentialIPv4 IPv650
AS24482SG.GSHostingIPv4 IPv626
AS394256Tech Futures Interactive Inc.UnclassifiedIPv4 IPv626
AS3130RGnet OUUnclassifiedIPv425

All 16 upstreams →

Transit

Downstream networks

inferred

Networks for which AS21804 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS53543EVSLUnclassifiedIPv4945
AS397894Regina Exhibition Association LtdUnclassifiedIPv4 IPv627
AS10980Stafford Communications, Inc.ResidentialIPv421

Adjacency

Adjacent networks

All 20

Every AS seen directly next to AS21804 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3257GTT Communications Inc.TransitIPv4 IPv61,047
AS53543EVSLUnclassifiedIPv4945
AS6939Hurricane Electric LLCTransitIPv4 IPv6327
AS6327Shaw CommunicationsResidentialIPv4 IPv6297
AS174Cogent Communications, LLCTransitIPv4280
AS9002RETN LimitedUnclassifiedIPv4 IPv6123
AS1403EBOXResidentialIPv4 IPv688
AS22652Videotron LteeResidentialIPv4 IPv683
AS394256Tech Futures Interactive Inc.UnclassifiedIPv4 IPv644
AS24482SG.GSHostingIPv4 IPv643

All 20 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-14 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.46M 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.