asn.dev

Observed topology

AS12337 NORIS-NETWORK noris network AG

Unclassified RIPE NSP

Upstreams 21 carry this network
Downstreams 27 this network carries
Adjacent (IPv4) 47
Adjacent (IPv6) 27
Upstream graph Who carries AS12337, and who carries them, drawn as a map up to the transit-free core. 6 exchanges Where AS12337 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 21

Networks observed carrying traffic for AS12337: 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
AS33891Core-Backbone GmbHHostingIPv4 IPv61,531
AS5405Inter.link GmbHUnclassifiedIPv4 IPv6710
AS1299Arelion Sweden ABTransitIPv4 IPv6652
AS2914NTT America, Inc.TransitIPv4 IPv6558
AS6939Hurricane Electric LLCTransitIPv4 IPv6547
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6221
AS174Cogent Communications, LLCTransitIPv4 IPv6160
AS3320Deutsche Telekom AGMobileIPv4 IPv6137
AS20546SOPRADO GmbHHostingIPv4120
AS24482SG.GSHostingIPv4 IPv682

All 21 upstreams →

Transit

Downstream networks

All 27

Networks for which AS12337 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS47409thinkproject Deutschland GmbHUnclassifiedIPv4434
AS60955Wavecon GmbHHostingIPv4 IPv6376
AS25115DIEHL Informatik GmbHUnclassifiedIPv4 IPv6246
AS44833Hans Peter GrohUnclassifiedIPv4 IPv6155
AS56636Cadence Design Systems GmbHUnclassifiedIPv4137
AS205497PAYBACK GmbHUnclassifiedIPv4122
AS61303NETWAYS GmbHUnclassifiedIPv4120
AS47897RED Medical Systems GmbHUnclassifiedIPv4 IPv697
AS52158Rail Power Systems GmbHUnclassifiedIPv4 IPv695
AS20572Giesecke & Devrient GmbHUnclassifiedIPv4 IPv694

All 27 downstreams →

Adjacency

Adjacent networks

All 49

Every AS seen directly next to AS12337 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS33891Core-Backbone GmbHHostingIPv4 IPv62,314
AS5405Inter.link GmbHUnclassifiedIPv4 IPv61,161
AS1299Arelion Sweden ABTransitIPv4 IPv6939
AS6939Hurricane Electric LLCTransitIPv4 IPv6859
AS2914NTT America, Inc.TransitIPv4 IPv6856
AS47409thinkproject Deutschland GmbHUnclassifiedIPv4434
AS60955Wavecon GmbHHostingIPv4 IPv6376
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6367
AS25115DIEHL Informatik GmbHUnclassifiedIPv4 IPv6246
AS174Cogent Communications, LLCTransitIPv4 IPv6215

All 49 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-13 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.40M 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.