asn.dev

Observed topology

AS12387 TON TON Total optical Networks AG

Unclassified ARIN

Upstreams 19 carry this network
Downstreams 26 this network carries
Adjacent (IPv4) 46
Adjacent (IPv6) 25
Upstream graph Who carries AS12387, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS12387 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 19

Networks observed carrying traffic for AS12387: 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 IPv682
AS23764CTGNetUnclassifiedIPv460
AS6939Hurricane Electric LLCTransitIPv4 IPv645
AS4455IX Reach LtdUnclassifiedIPv4 IPv630
AS9002RETN LimitedUnclassifiedIPv4 IPv625
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv67
AS6730Sunrise GmbHMobileIPv4 IPv64
AS24482SG.GSHostingIPv4 IPv64
AS49432Dominic Schallert trading as schallert.com e.U.UnclassifiedIPv4 IPv64
AS1836green.ch AGResidentialIPv43

All 19 upstreams →

Transit

Downstream networks

All 26

Networks for which AS12387 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS25435META10 AGUnclassifiedIPv44,141
AS205357winVS software AGUnclassifiedIPv4248
AS205737Naveum AGUnclassifiedIPv4 IPv6159
AS50598SFS Group Schweiz AGUnclassifiedIPv4 IPv6150
AS197964Julius Blum GmbHUnclassifiedIPv4 IPv6104
AS207335i-Community AGUnclassifiedIPv4 IPv698
AS48576Dr. Risch AGUnclassifiedIPv4 IPv687
AS25581GMG AGHostingIPv4 IPv686
AS210736Hamilton Services AGUnclassifiedIPv4 IPv682
AS20914Gluecklich GmbHUnclassifiedIPv4 IPv680

All 26 downstreams →

Adjacency

Adjacent networks

All 48

Every AS seen directly next to AS12387 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS25435META10 AGUnclassifiedIPv44,141
AS33891Core-Backbone GmbHHostingIPv4 IPv62,269
AS4455IX Reach LtdUnclassifiedIPv4 IPv61,019
AS6939Hurricane Electric LLCTransitIPv4 IPv6866
AS9002RETN LimitedUnclassifiedIPv4 IPv6503
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6326
AS205357winVS software AGUnclassifiedIPv4248
AS6730Sunrise GmbHMobileIPv4 IPv6166
AS205737Naveum AGUnclassifiedIPv4 IPv6159
AS50598SFS Group Schweiz AGUnclassifiedIPv4 IPv6150

All 48 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-04 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.33M 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.