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AS3661The Chinese University of Hong Kong

Hong Kong SAR ChinaRegistryAPNIC

As of 11th November 2026, AS3661 (The Chinese University of Hong Kong), a network registered in Hong Kong SAR China with APNIC, originates 7 IPv4 prefixes covering 74.2k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 2,993rd-largest of the 80,747 networks we see originating IPv4, and the 55th-largest of 760 in Hong Kong SAR China. It is seen behind 10 upstream networks, most often AS3662 (Joint Universities Computer Centre…) and AS6939 (Hurricane Electric LLC). None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

7

IPv6 prefixes

2

IPv4 addresses

74.2k

IPv6 /64s

4.3B

Upstream graph

The networks AS3661 is seen behind, one and two hops out, drawn from real AS paths.

AS3661Toward the internet core
Upstream graph for AS3661: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3661The Chinese Unive…This networkAS3662Joint Universitie…AS4641The Hong Kong Int…AS6939Hurricane Electri…AS7713PT Telkom Indones…AS137207Joint Universitie…AS17824Pacific One Net L…AS6453TATA Communicatio…AS20130Depaul UniversityAS132337AxclusiveAS35280F5 Networks SARLAS11537Internet2AS23855Singapore Advance…

Networks observed one and two hops upstream of AS3661 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

27

adjacent networks

Upstreams
1037%
Peers
1763%
Downstreams
00%

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

Upstreams of AS3661
NetworkCountryRelationshipPathsVantage pts
AS3662Joint Universities Computer Centre LimitedHKPeer44278
AS6939Hurricane Electric LLCUSPeer12657
AS7713PT Telkom Indonesia TbkIDPeer195
AS137207Joint Universities Computer Centre LimitedHKPeer194
AS4641The Hong Kong Internet Exchange LimitedHKPeer114
AS4635HKIX Route ServersHKPeer102
AS18106Viewqwest Pte LtdSGPeer102
AS24482SG.GSSGPeer72
AS49544i3D.net B.VNLPeer72
AS132337AxclusiveSGAdjacent51

Prefixes

The largest blocks AS3661 originates, widest first.

Largest prefixes originated by AS3661
PrefixAddressesVisibility
137.189.0.0/1665.5k76/76
203.188.64.0/204.1k76/76
123.255.64.0/212k76/76
103.49.160.0/221k76/76
175.159.224.0/221k76/76
137.189.196.0/2425676/76
202.40.216.0/2425676/76
2405:3000::/324.3B × /6462/63
2001:ce0:3::/4865.5k × /6462/63

Routing health

How AS3661'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%9

Propagation

  • Globally propagated90% of full-feed peers or more100.0%9
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 7 prefixes

IPv6 — 2 prefixes

  • /324.3B × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS3661 started or stopped in this period.

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