asn.dev

Observed topology

AS51185 MAINSTREAMING-AS

Mobile APNIC

Upstreams 56 carry this network
Downstreams 0 this network carries
Adjacent (IPv4) 46
Adjacent (IPv6) 31
Upstream graph Who carries AS51185, and who carries them, drawn as a map up to the transit-free core. 22 exchanges Where AS51185 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 56

Networks observed carrying traffic for AS51185: 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
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6596
AS6939Hurricane Electric LLCTransitIPv4 IPv6483
AS174Cogent Communications, LLCTransitIPv4148
AS1299Arelion Sweden ABTransitIPv4 IPv676
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv667
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv651
AS24482SG.GSHostingIPv4 IPv643
AS50304Blix Solutions ASUnclassifiedIPv4 IPv642
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv638
AS34428Giulio Lo PrestiUnclassifiedIPv637

All 56 upstreams →

Transit

Downstream networks

inferred

Networks for which AS51185 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

All 56

Every AS seen directly next to AS51185 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6596
AS6939Hurricane Electric LLCTransitIPv4 IPv6483
AS174Cogent Communications, LLCTransitIPv4148
AS1299Arelion Sweden ABTransitIPv4 IPv676
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv667
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv651
AS24482SG.GSHostingIPv4 IPv643
AS50304Blix Solutions ASUnclassifiedIPv4 IPv642
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv638
AS34428Giulio Lo PrestiUnclassifiedIPv637

All 56 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-29 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.36M 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.