asn.dev

Observed topology

AS21013 ITANDTEL-AS Wels

Unclassified ARIN NSP

Upstreams 28 carry this network
Downstreams 34 this network carries
Adjacent (IPv4) 69
Adjacent (IPv6) 32
Upstream graph Who carries AS21013, and who carries them, drawn as a map up to the transit-free core. 9 exchanges Where AS21013 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 28

Networks observed carrying traffic for AS21013: 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
AS6939Hurricane Electric LLCTransitIPv4 IPv6123
AS33891Core-Backbone GmbHHostingIPv4 IPv6105
AS3356Level 3 Parent, LLCTransitIPv4 IPv672
AS1299Arelion Sweden ABTransitIPv4 IPv658
AS174Cogent Communications, LLCTransitIPv4 IPv653
AS3257GTT Communications Inc.TransitIPv444
AS6461Zayo BandwidthTransitIPv444
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv636
AS12605LIWEST Kabelmedien GmbHResidentialIPv432
AS1764Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbHUnclassifiedIPv422

All 28 upstreams →

Transit

Downstream networks

All 34

Networks for which AS21013 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS28919Stadtwerke Kufstein GmbHResidentialIPv4 IPv6767
AS204410Feistritzwerke-STEWEAG GmbHUnclassifiedIPv4 IPv6647
AS35579AktiengesellschaftResidentialIPv4 IPv6268
AS61108eww agUnclassifiedIPv4252
AS49864ECS Rockenschaub GmbHUnclassifiedIPv4 IPv6240
AS24792Stadtwerke Kitzbuehel e.U.UnclassifiedIPv4233
AS34318ASAK Glasfaser GmbHUnclassifiedIPv4182
AS44329NTS Netzwerk Telekom Service AGUnclassifiedIPv4 IPv6159
AS205202Cloudflight Austria GmbHUnclassifiedIPv4 IPv6136
AS205314TGW Holding GmbHUnclassifiedIPv4 IPv6136

All 34 downstreams →

Adjacency

Adjacent networks

All 71

Every AS seen directly next to AS21013 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS28919Stadtwerke Kufstein GmbHResidentialIPv4 IPv6971
AS6939Hurricane Electric LLCTransitIPv4 IPv6788
AS204410Feistritzwerke-STEWEAG GmbHUnclassifiedIPv4 IPv6647
AS6461Zayo BandwidthTransitIPv4572
AS174Cogent Communications, LLCTransitIPv4 IPv6527
AS3356Level 3 Parent, LLCTransitIPv4 IPv6475
AS1299Arelion Sweden ABTransitIPv4 IPv6461
AS33891Core-Backbone GmbHHostingIPv4 IPv6432
AS3257GTT Communications Inc.TransitIPv4402
AS35579AktiengesellschaftResidentialIPv4 IPv6328

All 71 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-26 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.14M 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.