subnet.im

AS12129123.Net, Inc.

United StatesRegistryARIN

As of 11th November 2026, AS12129 (123.Net, Inc.), a network registered in the United States with ARIN, originates 50 IPv4 prefixes covering 181k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 1,488th-largest of the 80,743 networks we see originating IPv4, and the 425th-largest of 18,754 in the United States. It is seen behind 16 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS6461 (Zayo Bandwidth), and in front of 97 downstream networks. 69% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 96% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

50

IPv6 prefixes

4

IPv4 addresses

181k

IPv6 /64s

4.6B

Upstream graph

The networks AS12129 is seen behind, one and two hops out, drawn from real AS paths.

AS12129Toward the internet core
Upstream graph for AS12129: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS12129123.Net, Inc.This networkAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS6453TATA Communicatio…AS6461Zayo BandwidthAS6939Hurricane Electri…AS13030Init7 (Switzerlan…AS16552Tiggee LLCAS8220COLTAS35280F5 Networks SARLAS32590Valve CorporationAS20130Depaul UniversityAS132337Axclusive

Networks observed one and two hops upstream of AS12129 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

241

adjacent networks

Upstreams
167%
Peers
12853%
Downstreams
9740%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS12129
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer21,689105
AS6461Zayo BandwidthUSPeer9,03564
AS6453TATA Communications (America) IncUSPeer4,16575
AS1299Arelion (fka. Telia Carrier)SEPeer3,72145
AS2914NTT America, Inc.USPeer3,17858
AS3257GTT Communications Inc.USPeer1,52574
AS3356Lumen (Level 3)USPeer1,12580
AS14537Continent 8 LLCUSPeer1,0872
AS49544i3D.net B.VNLPeer6212
AS174Cogent Communications, LLCUSPeer59112

Prefixes

All 54

The largest blocks AS12129 originates, widest first.

Largest prefixes originated by AS12129
PrefixAddressesVisibility
152.160.0.0/1732.8k76/76
152.160.128.0/1816.4k76/76
207.91.192.0/1816.4k76/76
65.183.160.0/198.2k76/76
66.103.224.0/198.2k76/76
69.39.64.0/198.2k76/76
74.126.0.0/198.2k76/76
209.124.32.0/198.2k76/76
209.131.0.0/198.2k76/76
216.234.96.0/198.2k76/76

Routing health

How AS12129's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid68.5%37
  • Invalid0.0%0
  • No ROA31.5%17

Propagation

  • Globally propagated90% of full-feed peers or more96.3%52
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%3.7%2

Prefix sizes

IPv4 — 50 prefixes

IPv6 — 4 prefixes

  • /324.3B × /6425.0%1
  • /36268M × /6425.0%1
  • /4865.5k × /6450.0%2

Recent changes

Announcements that started or stopped since 12th Oct 2026.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.