asn.dev

Observed topology

AS42845 BRETAGNETELECOM

Residential ARIN

Upstreams 13 carry this network
Downstreams 6 this network carries
Adjacent (IPv4) 17
Adjacent (IPv6) 11
Upstream graph Who carries AS42845, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS42845 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 13

Networks observed carrying traffic for AS42845: 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 IPv61,101
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6712
AS6939Hurricane Electric LLCTransitIPv4 IPv6435
AS24482SG.GSHostingIPv4 IPv643
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv643
AS50628Leonix Telecom SASUnclassifiedIPv4 IPv643
AS204092Association GRIFONUnclassifiedIPv4 IPv643
AS12779IT.Gate S.p.A.UnclassifiedIPv442
AS34927iFog GmbHHostingIPv442
AS37100SEACOM LimitedUnclassifiedIPv442

All 13 upstreams →

Transit

Downstream networks

inferred

Networks for which AS42845 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS8220COLT Technology Services Group LimitedHostingIPv4 IPv6159
AS43121SAS COMMUNICATION INTERACTIVEUnclassifiedIPv460
AS47977CEV Group SASUnclassifiedIPv460
AS198978Alkante SASUnclassifiedIPv4 IPv645
AS199117Adventiel SASUnclassifiedIPv414
AS3257GTT Communications Inc.TransitIPv4 IPv65

Adjacency

Adjacent networks

All 19

Every AS seen directly next to AS42845 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS198978Alkante SASUnclassifiedIPv4 IPv614,518
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv68,752
AS3257GTT Communications Inc.TransitIPv4 IPv65,393
AS8220COLT Technology Services Group LimitedHostingIPv4 IPv62,222
AS6939Hurricane Electric LLCTransitIPv4 IPv6472
AS37100SEACOM LimitedUnclassifiedIPv468
AS43121SAS COMMUNICATION INTERACTIVEUnclassifiedIPv460
AS47977CEV Group SASUnclassifiedIPv460
AS24482SG.GSHostingIPv4 IPv650
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv650

All 19 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.