asn.dev

Observed topology

AS20836 CDLAN-AS CDLAN SpA

Hosting RIPE NSP

Upstreams 12 carry this network
Downstreams 10 this network carries
Adjacent (IPv4) 21
Adjacent (IPv6) 13
Upstream graph Who carries AS20836, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS20836 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 12

Networks observed carrying traffic for AS20836: 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
AS3356Level 3 Parent, LLCTransitIPv4 IPv6468
AS1299Arelion Sweden ABTransitIPv4 IPv6192
AS6939Hurricane Electric LLCTransitIPv4 IPv6187
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6158
AS3303Swisscom (Schweiz) AGResidentialIPv4 IPv634
AS24482SG.GSHostingIPv4 IPv621
AS31543myNet GmbHResidentialIPv4 IPv620
AS174Cogent Communications, LLCTransitIPv416
AS59919Brainbox S.r.l.ResidentialIPv416
AS13030Init7 (Switzerland) Ltd.HostingIPv65

All 12 upstreams →

Transit

Downstream networks

inferred

Networks for which AS20836 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS34971CDLAN SpAHostingIPv4 IPv6567
AS199321Intesys Networking SrlUnclassifiedIPv4 IPv6150
AS42692Overweb SrlUnclassifiedIPv4 IPv6148
AS202095RCS MediaGroup S.p.a.UnclassifiedIPv4136
AS44473S.T. S.r.l.UnclassifiedIPv460
AS49431KPMG BUSINESS SERVICES SRLUnclassifiedIPv460
AS211740WISE DIALOG BANK SPAUnclassifiedIPv460
AS13160EMMELIBRI S.R.L.UnclassifiedIPv459
AS44567Technology Transfer Intercontinental S.R.LUnclassifiedIPv4 IPv649
AS202889ST WI-net SrlUnclassifiedIPv425

Adjacency

Adjacent networks

All 23

Every AS seen directly next to AS20836 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,012
AS34971CDLAN SpAHostingIPv4 IPv6567
AS1299Arelion Sweden ABTransitIPv4 IPv6432
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6398
AS6939Hurricane Electric LLCTransitIPv4 IPv6324
AS199321Intesys Networking SrlUnclassifiedIPv4 IPv6150
AS42692Overweb SrlUnclassifiedIPv4 IPv6148
AS202095RCS MediaGroup S.p.a.UnclassifiedIPv4136
AS3303Swisscom (Schweiz) AGResidentialIPv4 IPv690
AS44473S.T. S.r.l.UnclassifiedIPv460

All 23 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.