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AS4651The Communications Authority of Thailand (CAT)

ThailandRegistryAPNICTypeCarrier

As of 27th September 2026, AS4651 (The Communications Authority of…), a transit carrier registered in Thailand with APNIC, originates 37 IPv4 prefixes covering 10.2k addresses and 27 IPv6 prefixes. By IPv4 address space that makes it the 10,337th-largest of the 79,525 networks we see originating IPv4, and the 61st-largest of 456 in Thailand. It is seen behind 69 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS2914 (NTT America, Inc.), and in front of 40 downstream networks. 47% of its announcements have a valid RPKI ROA; 26 are RPKI-invalid. 59% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

37

IPv6 prefixes

27

IPv4 addresses

10.2k

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: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4651The Communication…This networkAS1273Vodafone Group PLCAS2497Internet Initiati…AS2914NTT America, Inc.AS6939Hurricane Electri…AS32590Valve CorporationAS6667Elisa OyjAS41811CONVERGENCE (GROU…AS3130RGnet OUAS49544i3D.net B.VAS1299Arelion (fka. Tel…AS18106Viewqwest Pte LtdAS20130Depaul University

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

430

adjacent networks

Upstreams
6916%
Peers
32175%
Downstreams
409%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 69.

Upstreams of AS4651
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer58,47371
AS2914NTT America, Inc.USPeer15,71835
AS32590Valve CorporationUSPeer13,3485
AS2497Internet Initiative Japan Inc.JPPeer13,2765
AS1273Vodafone Group PLCEUPeer12,62135
AS1299Arelion (fka. Telia Carrier)SEPeer11,06454
AS13030Init7 (Switzerland) Ltd.CHPeer9,2624
AS49544i3D.net B.VNLPeer9,1504
AS14537Continent 8 LLCUSPeer9,1444
AS6453TATA Communications (America) IncUSPeer8,37229

Prefixes

All 64

The largest blocks AS4651 originates, widest first.

Largest prefixes originated by AS4651
PrefixAddressesVisibility
122.155.244.0/221k81/81
61.19.0.0/2425681/81
61.19.1.0/2425681/81
61.19.2.0/2425681/81
61.19.4.0/2425681/81
61.19.7.0/2425681/81
61.19.9.0/2425681/81
61.19.14.0/2425681/81
66.114.56.0/2425681/81
93.188.128.0/2425681/81

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

  • Valid46.9%30
  • Invalid40.6%26
  • 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 — 37 prefixes

IPv6 — 27 prefixes

  • /4865.5k × /643.7%1
  • /49 and longerAggregated96.3%26

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Withdrawn122.155.228.0/2421st Sept 2026

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