asn.dev

Observed topology

AS42104 CENTRLAN-AS

Unclassified RIPE

Upstreams 6 carry this network
Downstreams 0 this network carries
Adjacent (IPv4) 6
Adjacent (IPv6) 0
Upstream graph Who carries AS42104, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS42104 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS42104: 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
AS20764CJSC RASCOMUnclassifiedIPv4156
AS1299Arelion Sweden ABTransitIPv440
AS31133PJSC MegaFonMobileIPv440
AS9049JSC "ER-Telecom Holding"UnclassifiedIPv44
AS25478iHome LLCUnclassifiedIPv44
AS50384iHome LLCUnclassifiedIPv44

Transit

Downstream networks

inferred

Networks for which AS42104 was observed as the last hop before the origin, meaning it appears to provide them transit.

No downstream observed. This network does not appear to carry transit for anyone.

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS42104 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS20764CJSC RASCOMUnclassifiedIPv4162
AS31133PJSC MegaFonMobileIPv475
AS1299Arelion Sweden ABTransitIPv442
AS25478iHome LLCUnclassifiedIPv428
AS9049JSC "ER-Telecom Holding"UnclassifiedIPv47
AS50384iHome LLCUnclassifiedIPv44

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-21 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.