asn.dev

Observed topology

AS12337 NORIS-NETWORK IT Service Provider located in Nuernberg, Germany

Unclassified RIPE NSP

Upstreams 21 carry this network
Downstreams 27 this network carries
Adjacent (IPv4) 46
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 IPv61,533
AS5405Inter.link GmbHUnclassifiedIPv4 IPv6710
AS1299Arelion Sweden ABTransitIPv4 IPv6657
AS2914NTT America, Inc.TransitIPv4 IPv6638
AS6939Hurricane Electric LLCTransitIPv4 IPv6545
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6221
AS174Cogent Communications, LLCTransitIPv4 IPv6162
AS3320Deutsche Telekom AGMobileIPv4 IPv6127
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 IPv6378
AS25115DIEHL Informatik GmbHUnclassifiedIPv4 IPv6248
AS44833Hans Peter GrohUnclassifiedIPv4 IPv6158
AS56636Cadence Design Systems GmbHUnclassifiedIPv4139
AS205497PAYBACK GmbHUnclassifiedIPv4124
AS61303NETWAYS GmbHUnclassifiedIPv4114
AS47897RED Medical Systems GmbHUnclassifiedIPv4 IPv698
AS20572Giesecke & Devrient GmbHUnclassifiedIPv4 IPv696
AS21433Accenture UK LimitedUnclassifiedIPv4 IPv696

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 IPv62,321
AS5405Inter.link GmbHUnclassifiedIPv4 IPv61,151
AS2914NTT America, Inc.TransitIPv4 IPv6969
AS1299Arelion Sweden ABTransitIPv4 IPv6949
AS6939Hurricane Electric LLCTransitIPv4 IPv6855
AS47409thinkproject Deutschland GmbHUnclassifiedIPv4434
AS60955Wavecon GmbHHostingIPv4 IPv6378
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6370
AS25115DIEHL Informatik GmbHUnclassifiedIPv4 IPv6248
AS174Cogent Communications, LLCTransitIPv4 IPv6217

All 49 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-31 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.50M 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.