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AS63747Central Post and Telecommunication (CPT)

VietnamRegistryAPNIC

As of 11th November 2026, AS63747 (Central Post and Telecommunication (CPT)), a network registered in Vietnam with APNIC, originates 16 IPv4 prefixes covering 4.1k addresses. By IPv4 address space that makes it the 17,380th-largest of the 80,743 networks we see originating IPv4, and the 67th-largest of 537 in Vietnam. It is seen behind 2 upstream networks, most often AS45899 (VNPT Corp) and AS7552 (Viettel Group). Every one of its announcements has 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

16

IPv6 prefixes

0

IPv4 addresses

4.1k

IPv6 /64s

0

Upstream graph

The networks AS63747 is seen behind, one and two hops out, drawn from real AS paths.

AS63747Toward the internet core
Upstream graph for AS63747: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS63747Central Post and …This networkAS7552Viettel GroupAS45899VNPT CorpAS2914NTT America, Inc.AS3491PCCW Global (HK) …AS4229Zenlayer IncAS23764China Telecom Glo…

Networks observed one and two hops upstream of AS63747 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

4

adjacent networks

Upstreams
250%
Peers
250%
Downstreams
00%

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

Upstreams of AS63747
NetworkCountryRelationshipPathsVantage pts
AS45899VNPT CorpVNPeer93963
AS7552Viettel GroupVNPeer27776

Prefixes

The largest blocks AS63747 originates, widest first.

Largest prefixes originated by AS63747
PrefixAddressesVisibility
45.252.240.0/2425676/76
45.252.241.0/2425676/76
45.252.242.0/2425676/76
45.252.243.0/2425676/76
45.252.244.0/2425676/76
45.252.245.0/2425676/76
45.252.246.0/2425676/76
45.252.247.0/2425676/76
103.221.224.0/2425676/76
103.221.225.0/2425676/76

Routing health

How AS63747'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%16
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%16
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 16 prefixes

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS63747 started or stopped in this period.

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