subnet.im

AS45903CMC Telecom Infrastructure Company

VietnamRegistryAPNICTypeEyeball

As of 11th November 2026, AS45903 (CMC Telecom Infrastructure Company), an access network registered in Vietnam with APNIC, originates 363 IPv4 prefixes covering 199k addresses and 163 IPv6 prefixes. By IPv4 address space that makes it the 1,369th-largest of the 80,743 networks we see originating IPv4, and the 6th-largest of 537 in Vietnam. It is seen behind 65 upstream networks, most often AS9304 (HGC Global Communications Limited) and AS3491 (PCCW Global (HK) Ltd.), and in front of 111 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

363

IPv6 prefixes

163

IPv4 addresses

199k

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 IncAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS24516Virtutel Pty LtdAS58511Swoop (Anycast Gl…AS6453TATA Communicatio…AS1299Arelion (fka. Tel…AS6939Hurricane Electri…

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

503

adjacent networks

Upstreams
6513%
Peers
32765%
Downstreams
11122%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 65.

Upstreams of AS45903
NetworkCountryRelationshipPathsVantage pts
AS9304HGC Global Communications LimitedHKPeer20,130139
AS3491PCCW Global (HK) Ltd.HKPeer15,154107
AS15412Flag Telecom UK LimitedGBPeer10,500138
AS2914NTT America, Inc.USPeer9,30793
AS21859Zenlayer IncUSPeer3,47776
AS7473Singapore Telecommunications LtdSGPeer1,24060
AS49544i3D.net B.VNLPeer1,1704
AS18106Viewqwest Pte LtdSGPeer1,0734
AS35280F5 Networks SARLFRPeer1,0406
AS7713PT Telkom Indonesia TbkIDPeer9958

Prefixes

All 526

The largest blocks AS45903 originates, widest first.

Largest prefixes originated by AS45903
PrefixAddressesVisibility
42.96.32.0/198.2k76/76
113.20.96.0/198.2k76/76
119.82.128.0/204.1k6/76
183.91.0.0/204.1k76/76
183.91.16.0/204.1k76/76
101.99.0.0/212k76/76
101.99.8.0/212k76/76
101.99.16.0/212k76/76
101.99.24.0/212k76/76
101.99.32.0/212k76/76

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%526
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more92.4%486
  • Partially propagated40% to 90%0.2%1
  • Seen by few peersUnder 40%7.4%39

Prefix sizes

IPv4 — 363 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 12th Oct 2026.

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