asn.dev

Observed topology

AS513 CERN CERN - European Organization for Nuclear Research

Unclassified RIPE

Upstreams 9 carry this network
Downstreams 6 this network carries
Adjacent (IPv4) 15
Adjacent (IPv6) 10
Upstream graph Who carries AS513, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS513 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS513: 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
AS25091IP-Max SAUnclassifiedIPv4 IPv6524
AS21320GEANT VerenigingUnclassifiedIPv4 IPv6210
AS174Cogent Communications, LLCTransitIPv4 IPv6186
AS6939Hurricane Electric LLCTransitIPv4 IPv6182
AS29222Infomaniak Network SAHostingIPv4 IPv6128
AS20965GEANT VerenigingUnclassifiedIPv4 IPv662
AS6730Sunrise GmbHMobileIPv440
AS1103SURF B.V.UnclassifiedIPv4 IPv622
AS293ESnetUnclassifiedIPv420

Transit

Downstream networks

inferred

Networks for which AS513 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS48751United Nations Logistics BaseUnclassifiedIPv4118
AS20940Akamai International B.V.HostingIPv4 IPv699
AS28810World Health Organization (WHO)UnclassifiedIPv497
AS21449Etat de GeneveUnclassifiedIPv4 IPv660
AS12654Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv621
AS25152Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv42

Adjacency

Adjacent networks

All 15

Every AS seen directly next to AS513 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS25091IP-Max SAUnclassifiedIPv4 IPv6674
AS21320GEANT VerenigingUnclassifiedIPv4 IPv6260
AS29222Infomaniak Network SAHostingIPv4 IPv6217
AS174Cogent Communications, LLCTransitIPv4 IPv6213
AS6939Hurricane Electric LLCTransitIPv4 IPv6206
AS48751United Nations Logistics BaseUnclassifiedIPv4118
AS20940Akamai International B.V.HostingIPv4 IPv699
AS20965GEANT VerenigingUnclassifiedIPv4 IPv697
AS28810World Health Organization (WHO)UnclassifiedIPv497
AS21449Etat de GeneveUnclassifiedIPv4 IPv660

All 15 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-05 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 73.57M 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.