Observed topology

AS25509 VORTEX-AS Skulagotu 19

Residential RIPE Cable/DSL/ISP

Upstreams 22 carry this network

Downstreams 1 this network carries

Adjacent (IPv4) 23

Adjacent (IPv6) 1

Upstream graph Who carries AS25509, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS25509 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 22

Networks observed carrying traffic for AS25509: 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.

AS	Network	Type	Families	Paths seen
AS174	Cogent Communications, LLC	Transit	IPv4 IPv6	60
AS6939	Hurricane Electric LLC	Transit	IPv4	8
AS34549	meerfarbig GmbH & Co. KG	Hosting	IPv4	3
AS50304	Blix Solutions AS	Unclassified	IPv4	2
AS1836	green.ch AG	Residential	IPv4	1
AS3741	Dimension Data	Unclassified	IPv4	1
AS4657	StarHub Ltd	Residential	IPv4	1
AS8551	Bezeq International Ltd.	Unclassified	IPv4	1
AS12552	GlobalConnect AB	Unclassified	IPv4	1
AS12779	IT.Gate S.p.A.	Unclassified	IPv4	1

All 22 upstreams →

Transit

Downstream networks

inferred

Networks for which AS25509 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS34678	Eignafelag Tolvunar ehf	Unclassified	IPv4	59

Adjacency

Adjacent networks

All 23

Every AS seen directly next to AS25509 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS174	Cogent Communications, LLC	Transit	IPv4 IPv6	88
AS34678	Eignafelag Tolvunar ehf	Unclassified	IPv4	59
AS6939	Hurricane Electric LLC	Transit	IPv4	16
AS34549	meerfarbig GmbH & Co. KG	Hosting	IPv4	6
AS50304	Blix Solutions AS	Unclassified	IPv4	4
AS1836	green.ch AG	Residential	IPv4	2
AS3741	Dimension Data	Unclassified	IPv4	2
AS4657	StarHub Ltd	Residential	IPv4	2
AS8551	Bezeq International Ltd.	Unclassified	IPv4	2
AS12552	GlobalConnect AB	Unclassified	IPv4	2

All 23 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-31 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.50M 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.