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AS4651The Communications Authority of Thailand (CAT)

ThailandRegistryAPNICTypeCarrier

As of 12th November 2026, AS4651 (The Communications Authority of…), a transit carrier registered in Thailand with APNIC, originates 38 IPv4 prefixes covering 10.5k addresses and 26 IPv6 prefixes. By IPv4 address space that makes it the 10,376th-largest of the 80,772 networks we see originating IPv4, and the 61st-largest of 464 in Thailand. It is seen behind 68 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS2914 (NTT America, Inc.), and in front of 41 downstream networks. 48% of its announcements have a valid RPKI ROA; 25 are RPKI-invalid. 59% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

38

IPv6 prefixes

26

IPv4 addresses

10.5k

IPv6 /64s

65.6k

Upstream graph

The networks AS4651 is seen behind, one and two hops out, drawn from real AS paths.

AS4651Toward the internet core
Upstream graph for AS4651: 10 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4651The Communication…This networkAS2497Internet Initiati…AS2914NTT America, Inc.AS6939Hurricane Electri…AS32590Valve CorporationAS35280F5 Networks SARLAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS20130Depaul UniversityAS132337AxclusiveAS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS4651 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

428

adjacent networks

Upstreams
6816%
Peers
31975%
Downstreams
4110%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 68.

Upstreams of AS4651
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer50,09776
AS2914NTT America, Inc.USPeer14,55148
AS2497Internet Initiative Japan Inc.JPPeer13,6845
AS32590Valve CorporationUSPeer13,6335
AS35280F5 Networks SARLFRPeer13,1356
AS1299Arelion (fka. Telia Carrier)SEPeer10,41554
AS1273Vodafone Group PLCEUPeer9,68632
AS13030Init7 (Switzerland) Ltd.CHPeer9,4804
AS14537Continent 8 LLCUSPeer9,3734
AS49544i3D.net B.VNLPeer9,3104

Prefixes

All 64

The largest blocks AS4651 originates, widest first.

Largest prefixes originated by AS4651
PrefixAddressesVisibility
122.155.244.0/221k78/78
61.19.0.0/2425678/78
61.19.1.0/2425678/78
61.19.2.0/2425678/78
61.19.4.0/2425678/78
61.19.7.0/2425678/78
61.19.9.0/2425678/78
61.19.14.0/2425678/78
66.114.56.0/2425678/78
93.188.128.0/2425678/78

Routing health

How AS4651'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

  • Valid48.4%31
  • Invalid39.1%25
  • No ROA12.5%8

Propagation

  • Globally propagated90% of full-feed peers or more59.4%38
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%40.6%26

Prefix sizes

IPv4 — 38 prefixes

IPv6 — 26 prefixes

  • /4865.5k × /643.8%1
  • /49 and longerAggregated96.2%25

Recent changes

Announcements that started or stopped since 13th Oct 2026.

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