asn.dev

Observed topology

AS12387 TON TON Total optical Networks AG

Unclassified ARIN

Upstreams 20 carry this network
Downstreams 26 this network carries
Adjacent (IPv4) 47
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 20

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 IPv679
AS23764CTGNetUnclassifiedIPv461
AS6939Hurricane Electric LLCTransitIPv4 IPv642
AS4455IX Reach LtdUnclassifiedIPv4 IPv637
AS9002RETN LimitedUnclassifiedIPv4 IPv620
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 20 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 AGUnclassifiedIPv44,151
AS205357winVS software AGUnclassifiedIPv4248
AS205737Naveum AGUnclassifiedIPv4 IPv6158
AS50598SFS Group Schweiz AGUnclassifiedIPv4 IPv6155
AS197964Julius Blum GmbHUnclassifiedIPv4 IPv6108
AS207335i-Community AGUnclassifiedIPv4 IPv699
AS48576Dr. Risch AGUnclassifiedIPv4 IPv687
AS25581GMG AGHostingIPv4 IPv686
AS208065Leica Geosystems AGUnclassifiedIPv484
AS210736Hamilton Services AGUnclassifiedIPv4 IPv682

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 AGUnclassifiedIPv44,151
AS33891Core-Backbone GmbHHostingIPv4 IPv62,191
AS4455IX Reach LtdUnclassifiedIPv4 IPv61,216
AS6939Hurricane Electric LLCTransitIPv4 IPv6845
AS9002RETN LimitedUnclassifiedIPv4 IPv6337
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6332
AS205357winVS software AGUnclassifiedIPv4248
AS205737Naveum AGUnclassifiedIPv4 IPv6158
AS50598SFS Group Schweiz AGUnclassifiedIPv4 IPv6155
AS6730Sunrise GmbHMobileIPv4 IPv6146

All 48 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.