asn.dev

Observed topology

AS42845 Bretagnetelecom BLUE SAS

Residential ARIN Cable/DSL/ISP

Upstreams 14 carry this network
Downstreams 7 this network carries
Adjacent (IPv4) 18
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 14

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 IPv61,057
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6672
AS6939Hurricane Electric LLCTransitIPv4 IPv6435
AS33891Core-Backbone GmbHHostingIPv484
AS24482SG.GSHostingIPv4 IPv643
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv643
AS50628Leonix Telecom SASUnclassifiedIPv4 IPv643
AS204092Association GRIFONUnclassifiedIPv4 IPv643
AS12779IT.Gate S.p.A.UnclassifiedIPv442
AS34927iFog GmbHHostingIPv442

All 14 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
AS47977CEV Group SASUnclassifiedIPv460
AS43121SAS COMMUNICATION INTERACTIVEUnclassifiedIPv459
AS198978Alkante SASUnclassifiedIPv4 IPv646
AS199117Adventiel SASUnclassifiedIPv422
AS3257GTT Communications Inc.TransitIPv4 IPv65
AS60171AFR-IX TELECOM S.A.UnclassifiedIPv41

Adjacency

Adjacent networks

All 20

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

ASNetworkTypeFamiliesPaths seen
AS198978Alkante SASUnclassifiedIPv4 IPv615,194
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv69,004
AS3257GTT Communications Inc.TransitIPv4 IPv65,717
AS8220COLT Technology Services Group LimitedHostingIPv4 IPv62,229
AS6939Hurricane Electric LLCTransitIPv4 IPv6472
AS33891Core-Backbone GmbHHostingIPv494
AS37100SEACOM LimitedUnclassifiedIPv475
AS47977CEV Group SASUnclassifiedIPv460
AS43121SAS COMMUNICATION INTERACTIVEUnclassifiedIPv459
AS50628Leonix Telecom SASUnclassifiedIPv4 IPv650

All 20 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-10 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 71.97M 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.