asn.dev

Observed topology

AS21100 ITLDC-EU ROUTE 95 LLC

Hosting RIPE

Upstreams 26 carry this network
Downstreams 6 this network carries
Adjacent (IPv4) 30
Adjacent (IPv6) 17
Upstream graph Who carries AS21100, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS21100 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 26

Networks observed carrying traffic for AS21100: 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
AS9002RETN LimitedUnclassifiedIPv4 IPv6844
AS6461Zayo BandwidthTransitIPv4 IPv6352
AS24961WIIT AGHostingIPv4324
AS174Cogent Communications, LLCTransitIPv4 IPv6240
AS6939Hurricane Electric LLCTransitIPv4 IPv6185
AS24785Broadband Hosting B.V.HostingIPv4 IPv656
AS20562Broadband Hosting B.V.HostingIPv650
AS24482SG.GSHostingIPv4 IPv627
AS6696VERIXI SAUnclassifiedIPv425
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv624

All 26 upstreams →

Transit

Downstream networks

inferred

Networks for which AS21100 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS202051NETGRID HOST LTDUnclassifiedIPv4584
AS199058SERVA ONE LTDUnclassifiedIPv4530
AS200313IT WEB LTDUnclassifiedIPv4 IPv6387
AS15800COORDINATOR LTDUnclassifiedIPv4 IPv692
AS29012Scana LTDUnclassifiedIPv458
AS29067LLC "Hostmaster"HostingIPv4 IPv66

Adjacency

Adjacent networks

All 33

Every AS seen directly next to AS21100 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS9002RETN LimitedUnclassifiedIPv4 IPv61,660
AS202051NETGRID HOST LTDUnclassifiedIPv4584
AS24961WIIT AGHostingIPv4540
AS199058SERVA ONE LTDUnclassifiedIPv4530
AS6461Zayo BandwidthTransitIPv4 IPv6410
AS200313IT WEB LTDUnclassifiedIPv4 IPv6387
AS6939Hurricane Electric LLCTransitIPv4 IPv6340
AS174Cogent Communications, LLCTransitIPv4 IPv6277
AS24785Broadband Hosting B.V.HostingIPv4 IPv6129
AS15800COORDINATOR LTDUnclassifiedIPv4 IPv692

All 33 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-11 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 73.24M 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.