AS3661
The Chinese University of Hong Kong
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Academic allocation +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 1 internet exchange: HKIX: HKIX Peering LAN
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 137.189.0.0/16 | 65.5K |
11.6%
|
The Chinese University of Hong Kong | HK | Sha Tin | Fo Tan |
| 203.188.64.0/20 | 4.1K |
97.3%
|
The Chinese University of Hong Kong | HK | — | — |
| 123.255.64.0/21 | 2.0K |
4.6%
|
The Chinese University of Hong Kong | HK | — | — |
| 103.49.160.0/22 | 1.0K |
1.0%
|
The Chinese University of Hong Kong | HK | — | — |
| 175.159.224.0/22 | 1.0K |
0.0%
|
The Chinese University of Hong Kong | HK | — | — |
| 202.40.216.0/24 | 256 |
1.6%
|
The Chinese University of Hong Kong | HK | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS3661 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 175.159.224.0/22 | 8,269 | 2026-07-21 17:27:33 |
| 103.49.160.0/22 | 8,164 | 2026-07-21 17:27:27 |
| 137.189.196.0/24 | 7,573 | 2026-07-21 17:27:27 |
| 123.255.64.0/21 | 7,360 | 2026-07-21 17:27:33 |
| 202.40.216.0/24 | 7,204 | 2026-07-21 17:27:33 |
| 137.189.0.0/16 | 7,165 | 2026-07-21 17:27:27 |
| 203.188.64.0/20 | 7,099 | 2026-07-21 17:27:57 |
| 137.189.133.0/24 | 5,966 | 2026-05-24 12:54:52 |
| 137.189.172.0/24 | 5,862 | 2026-07-10 23:06:19 |
Frequently Asked Questions
What is AS3661?
AS3661 is an Autonomous System Number assigned to The Chinese University of Hong Kong. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS3661 announce?
AS3661 announces 74.0K IPv4 addresses distributed across 6 routed CIDR prefixes. The network is registered in Hong Kong.
Who operates AS3661?
AS3661 is operated by The Chinese University of Hong Kong. The organization is based in Hong Kong. You can view all IP ranges and related ASNs on the organization page.
What country is AS3661 registered in?
AS3661 is registered in Hong Kong. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
