asn.dev

Observed topology

AS12129 123NET

Hosting ARIN

Upstreams 10 carry this network
Downstreams 95 this network carries
Adjacent (IPv4) 105
Adjacent (IPv6) 31
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 IPv62,040
AS1299Arelion Sweden ABTransitIPv4 IPv6242
AS6461Zayo BandwidthTransitIPv4 IPv6238
AS174Cogent Communications, LLCTransitIPv4 IPv6237
AS3356Level 3 Parent, LLCTransitIPv4 IPv6153
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv495
AS2914NTT America, Inc.TransitIPv4 IPv694
AS396998Path Network, Inc.UnclassifiedIPv459
AS3257GTT Communications Inc.TransitIPv446
AS20205Amplex Electric, Inc.ResidentialIPv446

Transit

Downstream networks

All 95

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 IPv64,863
AS14938Bullseye TelecomUnclassifiedIPv42,752
AS401307Michigan Statewide Educational NetworkUnclassifiedIPv42,547
AS32477Otava, LLCUnclassifiedIPv4 IPv61,296
AS22379Manifold Services IncUnclassifiedIPv4 IPv61,284
AS19901BrightspeedResidentialIPv4 IPv6921
AS11115Otava, LLCHostingIPv4 IPv6673
AS54932M3 Wireless Inc.ResidentialIPv4640
AS393474St. Clair County Regional Educational Service AgencyUnclassifiedIPv4613
AS19224Quantum Services Group, LLC.UnclassifiedIPv4 IPv6560

All 95 downstreams →

Adjacency

Adjacent networks

All 106

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

ASNetworkTypeFamiliesPaths seen
AS6939Hurricane Electric LLCTransitIPv4 IPv623,770
AS401307Michigan Statewide Educational NetworkUnclassifiedIPv49,994
AS27216Air Advantage LLCResidentialIPv4 IPv65,012
AS6461Zayo BandwidthTransitIPv4 IPv62,947
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv62,812
AS14938Bullseye TelecomUnclassifiedIPv42,752
AS1299Arelion Sweden ABTransitIPv4 IPv62,467
AS174Cogent Communications, LLCTransitIPv4 IPv61,904
AS2914NTT America, Inc.TransitIPv4 IPv61,779
AS32477Otava, LLCUnclassifiedIPv4 IPv61,354

All 106 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-15 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.09M 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.