asn.dev

Observed topology

AS18451 LESNET

Unclassified ARIN NSP

Upstreams 6 carry this network
Downstreams 12 this network carries
Adjacent (IPv4) 17
Adjacent (IPv6) 14
Upstream graph Who carries AS18451, and who carries them, drawn as a map up to the transit-free core. 6 exchanges Where AS18451 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS18451: 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 IPv6262
AS6461Zayo BandwidthTransitIPv4 IPv643
AS174Cogent Communications, LLCTransitIPv4 IPv630
AS3257GTT Communications Inc.TransitIPv4 IPv616
AS32621Twin City VoIP, Inc.HostingIPv410
AS34927iFog GmbHHostingIPv61

Transit

Downstream networks

All 12

Networks for which AS18451 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS23523Voyageur Internet IncUnclassifiedIPv4260
AS31914Hutterian Broadband Network IncUnclassifiedIPv4 IPv6215
AS53356Free Range Cloud Hosting Inc.HostingIPv4 IPv6209
AS395089Hextet SystemsUnclassifiedIPv4 IPv6140
AS27618T. Grand Networks Inc.ResidentialIPv4 IPv6102
AS402087Computer JonesUnclassifiedIPv4 IPv6102
AS395611Manitoba Internet Exchange IncUnclassifiedIPv4 IPv668
AS393445Xplore Inc.UnclassifiedIPv4 IPv667
AS401147Pivotal ElementsHostingIPv4 IPv667
AS397728Taylor McCaffrey LLPUnclassifiedIPv448

All 12 downstreams →

Adjacency

Adjacent networks

All 18

Every AS seen directly next to AS18451 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6939Hurricane Electric LLCTransitIPv4 IPv61,256
AS23523Voyageur Internet IncUnclassifiedIPv4260
AS6461Zayo BandwidthTransitIPv4 IPv6252
AS395089Hextet SystemsUnclassifiedIPv4 IPv6251
AS31914Hutterian Broadband Network IncUnclassifiedIPv4 IPv6247
AS53356Free Range Cloud Hosting Inc.HostingIPv4 IPv6209
AS174Cogent Communications, LLCTransitIPv4 IPv6149
AS27618T. Grand Networks Inc.ResidentialIPv4 IPv6102
AS402087Computer JonesUnclassifiedIPv4 IPv6102
AS3257GTT Communications Inc.TransitIPv4 IPv695

All 18 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.