Observed topology

AS13041 CESCA-AC

Unclassified RIPE

Upstreams 4 carry this network

Downstreams 4 this network carries

Adjacent (IPv4) 7

Adjacent (IPv6) 5

Upstream graph Who carries AS13041, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS13041 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS13041: 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
AS766	Entidad Publica Empresarial Red.es	Unclassified	IPv4 IPv6	423
AS6939	Hurricane Electric LLC	Transit	IPv4	78
AS12479	Orange Espagne SA	Residential	IPv4 IPv6	37
AS35699	Adamo Telecom Iberia S.A.	Unclassified	IPv4	12

Transit

Downstream networks

inferred

Networks for which AS13041 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS15633	Universitat Oberta de Catalunya	Unclassified	IPv4	120
AS43115	Consorci Institut de Fisica Altes Energies	Unclassified	IPv4 IPv6	97
AS49638	Consorci de Serveis Universitaris de Catalunya	Unclassified	IPv4 IPv6	62
AS214516	Fundacion Universitaria San Pablo-CEU	Unclassified	IPv6	37

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS13041 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS766	Entidad Publica Empresarial Red.es	Unclassified	IPv4 IPv6	668
AS15633	Universitat Oberta de Catalunya	Unclassified	IPv4	120
AS12479	Orange Espagne SA	Residential	IPv4 IPv6	99
AS43115	Consorci Institut de Fisica Altes Energies	Unclassified	IPv4 IPv6	97
AS6939	Hurricane Electric LLC	Transit	IPv4	87
AS49638	Consorci de Serveis Universitaris de Catalunya	Unclassified	IPv4 IPv6	62
AS214516	Fundacion Universitaria San Pablo-CEU	Unclassified	IPv6	37
AS35699	Adamo Telecom Iberia S.A.	Unclassified	IPv4	12

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-25 12:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.17M 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.