AS3661 The Chinese University of Hong Kong

ERX-CUHKNET - The Chinese University of Hong Kong · registered in Hong Kong

IPv4 addresses73,98414 prefixes · 0.002% of announced IPv4

Rank in Hong Kong#45largest network in HK by IPv4 space, of 735 · 0.38% of HK

Rank worldwide#2,324of 79,396 networks with IPv4

IPv61 x /32 (65,537 x /48)2 prefixes

CountryHong Kong779 ASNs registered there

Open AS3661 in ASN lookup Look up an IP in this network (103.49.160.1) All networks in Hong Kong

IPv4 prefixes

All 14 prefixes, in address order.

103.49.160.0/22
123.255.64.0/21
137.189.0.0/17
137.189.128.0/18
137.189.192.0/22
137.189.196.0/24
137.189.197.0/24
137.189.198.0/23
137.189.200.0/21
137.189.208.0/20
137.189.224.0/19
175.159.224.0/22
202.40.216.0/24
203.188.64.0/20

IPv6 prefixes

All 2 prefixes.

2001:ce0:3::/48
2405:3000::/32

Similar-sized networks in Hong Kong

ASNNameIPv4 addresses

AS9925#42 HKTDCS-AS-AP - VDC Powerbase Hong Kong Data Centers Limited75,520

AS138995#43 ANTBOX1-AS-AP - Antbox Networks Limited74,496

AS4605#44 ERX-HKBUNET - Hong Kong Baptist University74,240

AS133199#46 SONDERCLOUDLIMITED-AS-AP - SonderCloud Limited73,728

AS45187#47 RACKSPACE-AP - Rackspace IT Hosting AS IT Hosting Provider Hong Kong66,816

AS9584#48 GENESIS-AP - Diyixian.com Limited66,048

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources