asn.dev

Observed topology

AS21782 PLATEAU

Unclassified ARIN Cable/DSL/ISP

Upstreams 3 carry this network
Downstreams 12 this network carries
Adjacent (IPv4) 16
Adjacent (IPv6) 5
Upstream graph Who carries AS21782, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS21782 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS21782: 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
AS6939Hurricane Electric LLCTransitIPv4 IPv6988
AS174Cogent Communications, LLCTransitIPv4 IPv6333
AS30029Dobson Technologies - Transport and Telecom Solutions, LLCUnclassifiedIPv42

Transit

Downstream networks

All 12

Networks for which AS21782 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS19156Continental Divide Electric Cooperative, IncUnclassifiedIPv4 IPv62,066
AS20356SIERRA COMMUNICATIONS, INC.UnclassifiedIPv4746
AS19881Valley Telecommunications CompanyUnclassifiedIPv4502
AS54434WNM CommunicationsUnclassifiedIPv4426
AS395245La Canada Wireless AssociationUnclassifiedIPv4 IPv6143
AS397108WNM CommunicationsUnclassifiedIPv4130
AS53266DFN SystemsUnclassifiedIPv4103
AS14235State of New MexicoUnclassifiedIPv4 IPv696
AS26196NNMTUnclassifiedIPv465
AS395452SFPSUnclassifiedIPv465

All 12 downstreams →

Adjacency

Adjacent networks

All 16

Every AS seen directly next to AS21782 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6939Hurricane Electric LLCTransitIPv4 IPv65,010
AS19156Continental Divide Electric Cooperative, IncUnclassifiedIPv4 IPv62,066
AS174Cogent Communications, LLCTransitIPv4 IPv6960
AS20356SIERRA COMMUNICATIONS, INC.UnclassifiedIPv4746
AS19881Valley Telecommunications CompanyUnclassifiedIPv4502
AS54434WNM CommunicationsUnclassifiedIPv4469
AS3912CHECSEducationIPv4160
AS395245La Canada Wireless AssociationUnclassifiedIPv4 IPv6143
AS397108WNM CommunicationsUnclassifiedIPv4130
AS53266DFN SystemsUnclassifiedIPv4103

All 16 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-26 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.