subnet.im

AS12129123.Net, Inc.

United StatesRegistryARIN

As of 13th October 2026, AS12129 (123.Net, Inc.), a network registered in the United States with ARIN, originates 48 IPv4 prefixes covering 180k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 1,461st-largest of the 79,585 networks we see originating IPv4, and the 417th-largest of 18,443 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 93 downstream networks. 69% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

48

IPv6 prefixes

4

IPv4 addresses

180k

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…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS8220COLTAS35280F5 Networks SARLAS32590Valve CorporationAS18106Viewqwest Pte LtdAS20130Depaul University

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

236

adjacent networks

Upstreams
167%
Peers
12754%
Downstreams
9339%

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

Upstreams of AS12129
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer26,246114
AS6461Zayo BandwidthUSPeer7,36165
AS6453TATA Communications (America) IncUSPeer5,51880
AS1299Arelion (fka. Telia Carrier)SEPeer2,96343
AS2914NTT America, Inc.USPeer2,16353
AS3257GTT Communications Inc.USPeer1,13278
AS14537Continent 8 LLCUSPeer1,0732
AS3356Lumen (Level 3)USPeer1,06682
AS174Cogent Communications, LLCUSPeer93518
AS49544i3D.net B.VNLPeer6482

Prefixes

All 52

The largest blocks AS12129 originates, widest first.

Largest prefixes originated by AS12129
PrefixAddressesVisibility
152.160.0.0/1732.8k81/81
152.160.128.0/1816.4k81/81
207.91.192.0/1816.4k81/81
65.183.160.0/198.2k81/81
66.103.224.0/198.2k81/81
69.39.64.0/198.2k81/81
74.126.0.0/198.2k81/81
209.124.32.0/198.2k81/81
209.131.0.0/198.2k81/81
216.234.96.0/198.2k81/81

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

  • Valid69.2%36
  • Invalid0.0%0
  • No ROA30.8%16

Propagation

  • Globally propagated90% of full-feed peers or more100.0%52
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 48 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 13th Sept 2026.

  • Announced207.91.203.0/2422nd Sept 2026
  • Withdrawn147.189.140.0/2421st Sept 2026
  • Withdrawn176.111.221.0/2421st Sept 2026
  • Withdrawn181.214.238.0/2321st Sept 2026
  • Withdrawn2606:6680:29::/4821st Sept 2026
  • Withdrawn2606:6680:30::/4821st Sept 2026
  • Withdrawn37.221.109.0/2421st Sept 2026
  • Withdrawn66.54.96.0/2221st Sept 2026
  • Withdrawn69.87.152.0/2421st Sept 2026

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