subnet.im

AS45903CMC Telecom Infrastructure Company

VietnamRegistryAPNICTypeEyeball

As of 27th September 2026, AS45903 (CMC Telecom Infrastructure Company), an access network registered in Vietnam with APNIC, originates 362 IPv4 prefixes covering 198k addresses and 163 IPv6 prefixes. By IPv4 address space that makes it the 1,352nd-largest of the 79,525 networks we see originating IPv4, and the 6th-largest of 523 in Vietnam. It is seen behind 67 upstream networks, most often AS9304 (HGC Global Communications Limited) and AS3491 (PCCW Global (HK) Ltd.), and in front of 109 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 92% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

362

IPv6 prefixes

163

IPv4 addresses

198k

IPv6 /64s

1.8B

Upstream graph

The networks AS45903 is seen behind, one and two hops out, drawn from real AS paths.

AS45903Toward the internet core
Upstream graph for AS45903: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS45903CMC Telecom Infra…This networkAS2914NTT America, Inc.AS3491PCCW Global (HK) …AS9304HGC Global Commun…AS15412Flag Telecom UK L…AS21859Zenlayer IncAS3130RGnet OUAS49544i3D.net B.VAS24516Virtutel Pty LtdAS58511Swoop (Anycast Gl…AS6453TATA Communicatio…AS6939Hurricane Electri…AS4229Zenlayer Inc

Networks observed one and two hops upstream of AS45903 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

508

adjacent networks

Upstreams
6713%
Peers
33265%
Downstreams
10921%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 67.

Upstreams of AS45903
NetworkCountryRelationshipPathsVantage pts
AS9304HGC Global Communications LimitedHKPeer21,318144
AS3491PCCW Global (HK) Ltd.HKPeer18,035119
AS2914NTT America, Inc.USPeer10,242105
AS15412Flag Telecom UK LimitedGBPeer10,193144
AS21859Zenlayer IncUSPeer4,04281
AS7473Singapore Telecommunications LtdSGPeer1,24561
AS49544i3D.net B.VNLPeer1,2254
AS5511Orange S.A.FRPeer1,120113
AS18106Viewqwest Pte LtdSGPeer1,0894
AS35280F5 Networks SARLFRPeer1,0866

Prefixes

All 525

The largest blocks AS45903 originates, widest first.

Largest prefixes originated by AS45903
PrefixAddressesVisibility
42.96.32.0/198.2k81/81
113.20.96.0/198.2k81/81
119.82.128.0/204.1k6/81
183.91.0.0/204.1k81/81
183.91.16.0/204.1k81/81
101.99.0.0/212k81/81
101.99.8.0/212k81/81
101.99.16.0/212k81/81
101.99.24.0/212k81/81
101.99.32.0/212k81/81

Routing health

How AS45903'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

  • Valid100.0%525
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more92.4%485
  • Partially propagated40% to 90%0.2%1
  • Seen by few peersUnder 40%7.4%39

Prefix sizes

IPv4 — 362 prefixes

IPv6 — 163 prefixes

  • /35537M × /641.8%3
  • /4016.8M × /644.3%7
  • /424.2M × /641.8%3
  • /441M × /649.8%16
  • /4865.5k × /6482.2%134

Recent changes

Announcements that started or stopped since 28th Aug 2026.

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