asn.dev

Observed topology

AS25521 AS-IPNET

Unclassified RIPE

Upstreams 24 carry this network
Downstreams 1 this network carries
Adjacent (IPv4) 20
Adjacent (IPv6) 14
Upstream graph Who carries AS25521, and who carries them, drawn as a map up to the transit-free core. 4 exchanges Where AS25521 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 24

Networks observed carrying traffic for AS25521: 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
AS6663Euroweb Romania S.R.L.UnclassifiedIPv4 IPv6400
AS3326PRIVATE JOINT STOCK COMPANY "DATAGROUP"ResidentialIPv4 IPv6203
AS6939Hurricane Electric LLCTransitIPv490
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv647
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv617
AS24482SG.GSHostingIPv4 IPv617
AS48185team.blue NVUnclassifiedIPv4 IPv617
AS48362Stadtwerke FeldkirchResidentialIPv4 IPv617
AS50300CustodianDC LimitedUnclassifiedIPv4 IPv617
AS212024Marc SchmittUnclassifiedIPv4 IPv617

All 24 upstreams →

Transit

Downstream networks

inferred

Networks for which AS25521 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS64418VI-PORT LLCUnclassifiedIPv45

Adjacency

Adjacent networks

All 25

Every AS seen directly next to AS25521 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6663Euroweb Romania S.R.L.UnclassifiedIPv4 IPv6403
AS3326PRIVATE JOINT STOCK COMPANY "DATAGROUP"ResidentialIPv4 IPv6205
AS6939Hurricane Electric LLCTransitIPv490
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv647
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv617
AS24482SG.GSHostingIPv4 IPv617
AS48185team.blue NVUnclassifiedIPv4 IPv617
AS48362Stadtwerke FeldkirchResidentialIPv4 IPv617
AS50300CustodianDC LimitedUnclassifiedIPv4 IPv617
AS212024Marc SchmittUnclassifiedIPv4 IPv617

All 25 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-20 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.16M 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.