asn.dev

Observed topology

AS12129 123NET - 123.Net, Inc.

Hosting ARIN NSP

Upstreams 10 carry this network
Downstreams 98 this network carries
Adjacent (IPv4) 108
Adjacent (IPv6) 32
Upstream graph Who carries AS12129, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS12129 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS12129: 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 IPv62,077
AS6461Zayo BandwidthTransitIPv4 IPv6284
AS174Cogent Communications, LLCTransitIPv4 IPv6237
AS1299Arelion Sweden ABTransitIPv4 IPv6197
AS3356Level 3 Parent, LLCTransitIPv4 IPv6154
AS3257GTT Communications Inc.TransitIPv4 IPv697
AS2914NTT America, Inc.TransitIPv4 IPv694
AS396998Path Network, Inc.UnclassifiedIPv460
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv449
AS20205Amplex Electric, Inc.ResidentialIPv446

Transit

Downstream networks

All 98

Networks for which AS12129 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS27216Air Advantage LLCResidentialIPv4 IPv65,015
AS14938Bullseye TelecomUnclassifiedIPv42,838
AS401307Michigan Statewide Educational NetworkUnclassifiedIPv42,577
AS22379Manifold Services IncUnclassifiedIPv4 IPv61,480
AS32477Otava, LLCUnclassifiedIPv4 IPv61,335
AS19901BrightspeedResidentialIPv4 IPv6876
AS11115Otava, LLCHostingIPv4 IPv6692
AS54932M3 Wireless Inc.ResidentialIPv4660
AS393474St. Clair County Regional Educational Service AgencyUnclassifiedIPv4639
AS5758ALPHA ENTERPRISES LIMITED, INC.UnclassifiedIPv4615

All 98 downstreams →

Adjacency

Adjacent networks

All 109

Every AS seen directly next to AS12129 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6939Hurricane Electric LLCTransitIPv4 IPv623,585
AS401307Michigan Statewide Educational NetworkUnclassifiedIPv410,090
AS27216Air Advantage LLCResidentialIPv4 IPv65,168
AS6461Zayo BandwidthTransitIPv4 IPv63,919
AS14938Bullseye TelecomUnclassifiedIPv42,838
AS1299Arelion Sweden ABTransitIPv4 IPv62,625
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv62,415
AS174Cogent Communications, LLCTransitIPv4 IPv62,164
AS2914NTT America, Inc.TransitIPv4 IPv61,827
AS22379Manifold Services IncUnclassifiedIPv4 IPv61,480

All 109 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.