asn.dev

Observed topology

AS39563 UCSYSTEMS CTA Systems B.V.

Unclassified RIPE NSP

Upstreams 23 carry this network
Downstreams 1 this network carries
Adjacent (IPv4) 22
Adjacent (IPv6) 15
Upstream graph Who carries AS39563, and who carries them, drawn as a map up to the transit-free core. 9 exchanges Where AS39563 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 23

Networks observed carrying traffic for AS39563: 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
AS35133Eranium B.V.HostingIPv4 IPv6129
AS20562Broadband Hosting B.V.HostingIPv4 IPv6125
AS24785Broadband Hosting B.V.HostingIPv4 IPv681
AS6939Hurricane Electric LLCTransitIPv456
AS43350NForce Entertainment B.V.UnclassifiedIPv4 IPv640
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv610
AS24482SG.GSHostingIPv4 IPv610
AS42708Glesys Sweden ABUnclassifiedIPv4 IPv610
AS48185team.blue NVUnclassifiedIPv4 IPv610
AS50304Blix Solutions ASUnclassifiedIPv4 IPv610

All 23 upstreams →

Transit

Downstream networks

inferred

Networks for which AS39563 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS35055Connect B.V.UnclassifiedIPv4 IPv650

Adjacency

Adjacent networks

All 24

Every AS seen directly next to AS39563 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS35133Eranium B.V.HostingIPv4 IPv6129
AS20562Broadband Hosting B.V.HostingIPv4 IPv6125
AS24785Broadband Hosting B.V.HostingIPv4 IPv681
AS6939Hurricane Electric LLCTransitIPv4 IPv675
AS43350NForce Entertainment B.V.UnclassifiedIPv4 IPv663
AS35055Connect B.V.UnclassifiedIPv4 IPv650
AS42708Glesys Sweden ABUnclassifiedIPv4 IPv614
AS401753BIXCE IncUnclassifiedIPv4 IPv614
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv610
AS24482SG.GSHostingIPv4 IPv610

All 24 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-07 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 72.97M 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.