asn.dev

Observed topology

AS21766 BEN-LOMAND-TEL

Unclassified ARIN Cable/DSL/ISP

Upstreams 8 carry this network
Downstreams 5 this network carries
Adjacent (IPv4) 13
Adjacent (IPv6) 8
Upstream graph Who carries AS21766, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS21766 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS21766: 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 IPv61,252
AS6939Hurricane Electric LLCTransitIPv4 IPv61,082
AS6461Zayo BandwidthTransitIPv4 IPv6973
AS3356Level 3 Parent, LLCTransitIPv4 IPv6659
AS174Cogent Communications, LLCTransitIPv4 IPv6328
AS1299Arelion Sweden ABTransitIPv4 IPv6281
AS11758IRIS NetworksUnclassifiedIPv4 IPv694
AS35280F5 Networks SARLHostingIPv411

Transit

Downstream networks

inferred

Networks for which AS21766 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS395437Highland Communications LLCUnclassifiedIPv43,528
AS54501Sequachee Valley Electric CooperativeUnclassifiedIPv4 IPv61,854
AS30264Columbia Power and Water SystemsUnclassifiedIPv41,716
AS31975University of the SouthUnclassifiedIPv4162
AS393542The Plateau Group, Inc.UnclassifiedIPv45

Adjacency

Adjacent networks

All 13

Every AS seen directly next to AS21766 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS395437Highland Communications LLCUnclassifiedIPv43,528
AS6461Zayo BandwidthTransitIPv4 IPv62,934
AS6939Hurricane Electric LLCTransitIPv4 IPv62,053
AS1299Arelion Sweden ABTransitIPv4 IPv61,902
AS54501Sequachee Valley Electric CooperativeUnclassifiedIPv4 IPv61,854
AS3257GTT Communications Inc.TransitIPv4 IPv61,730
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,722
AS30264Columbia Power and Water SystemsUnclassifiedIPv41,716
AS174Cogent Communications, LLCTransitIPv4 IPv61,087
AS11758IRIS NetworksUnclassifiedIPv4 IPv6506

All 13 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-20 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.16M 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.