AS3661 The Chinese University of Hong Kong

Hong Kong SAR China ERX-CUHKNET APNIC 7 IPv4 prefixes 2 IPv6 prefixes

IPv4 addresses

73,984

IPv6 /48 networks

65,537

RPKI

0 valid9 no ROA

Peers and downstreams

Holder

AS name: ERX-CUHKNET
Description: The Chinese University of Hong Kong Information Technology Services Centre
Organisation: The Chinese University of Hong Kong
Abuse contact: Not published
Assigned: 2002-07-31

103.49.160.0/22 123.255.64.0/21 137.189.0.0/16 137.189.196.0/24 175.159.224.0/22 202.40.216.0/24 203.188.64.0/20

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade D · 56/100

fail	Prefixes covered by valid ROAs 0 of 9 announced prefixes are RPKI valid, 9 have no ROA.	0/25
pass	No RPKI invalid announcements None of the announcements is RPKI invalid.	10/10
pass	Announces IPv6 2 IPv6 prefixes.	15/15
pass	More than one upstream 8 upstreams seen in BGP.	10/10
n/a	Working abuse contact We have no registry record to check.
fail	Publishes a geofeed No geofeed found. Without one, location databases have to guess.	0/10
pass	No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger.	10/10
n/a	Registry record maintained We have no change date for this record.

Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.

Show this on your website

HTML

<a href="https://ip-fd.net/asn/3661"><img src="https://ip-fd.net/badge/asn/3661/health.svg" alt="AS3661 network health on IP-FD.net"></a>

Markdown

[![AS3661 network health](https://ip-fd.net/badge/asn/3661/health.svg)](https://ip-fd.net/asn/3661)

Use rpki.svg instead of health.svg for the RPKI badge.

Routing changes

Last 30 days

2026-10-04 11:11 UTC	Relationship changed	AS8359	upstream to peer
2026-10-04 11:11 UTC	Relationship changed	AS7713	upstream to peer
2026-10-04 11:11 UTC	Relationship changed	AS4641	upstream to peer
2026-10-04 11:11 UTC	Relationship changed	AS4635	upstream to peer
2026-10-04 11:11 UTC	Relationship changed	AS45474	upstream to peer

Routing data

From the weekly collection

Registry record

From the nightly import

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/3661

const res = await fetch('https://ip-fd.net/api/v1/asn/3661', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/3661', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/3661');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/3661", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Works without a key at a lower rate. Get a free key.

AS3662	Joint Universities Computer Centre Limited HARNET
AS4635	Hong Kong Internet Exchange--Route Server 1 HKIX-RS1
AS4641	The Hong Kong Internet Exchange Limited HKIX-AS-AP
AS6939	Hurricane Electric LLC HURRICANE
AS7713	PT Telekomunikasi Indonesia telkomnet-as-ap
AS8359	MTS PJSC MTS
AS45474	Nexusguard Pte. Ltd. NEXUSGUARD-AS-AP
AS137207	Joint Universities Computer Centre Limited JUCC-AS-AP

AS18106	Viewqwest Pte Ltd VIEWQWEST-SG-AP
AS24482	SG.GS SGGS-AS-AP
AS36236	NetActuate, Inc NETACTUATE
AS49544	i3D.net B.V i3Dnet
AS55720	Gigabit Hosting Sdn Bhd GIGABIT-MY