Autonomous system
AS3661 ERX-CUHKNET The Chinese University of Hong Kong
Education APNIC
Summary
The Chinese University of Hong Kong (CUHK)
education university research legacy
ERX-CUHKNET is the campus network of The Chinese University of Hong Kong, one of Hong Kong's major research universities.
What it's used for
- Campus, research, and administrative networking for CUHK, including faculties, research institutes, libraries, and student residences.
- Onward connectivity for the university into Hong Kong's academic and commercial internet exchanges.
Notable
- The
ERX-prefix marks this as an Early Registration Transfer record: the allocation predates APNIC's authority over the region and was later moved from the ARIN-era registry into APNIC's care. - University address space is institutional — labs, offices, and campus Wi-Fi rather than residential subscribers.
Interesting
- Hong Kong's universities were among the earliest Asian institutions on the global internet, which is why one of them holds a number this far down the range.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Hong Kong Internet Exchange | Hong Kong, China | 123.255.91.50 |
Transit providers
7 upstream, 0 downstream and 10 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 14 prefixes · 73.98K addresses IPv6 2 prefixes
| Country | Name | Prefixes |
|---|---|---|
| HK | Hong Kong | 16 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS3661- Registry name
- ERX-CUHKNET
- Registrant
- The Chinese University of Hong Kong
- Abuse contact
- noc-admin@cuhk.edu.hk
- Registered
- 2008-09-04
- Last changed
- 2022-12-05
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- The Chinese University of Hong Kong AS 3661
- Scope
- Not Disclosed
- Traffic ratio
- Not Disclosed
- Present at
- 1 exchanges
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 9 with no ROA
- ROAs
- 1 authorising AS3661
- ASPA
- no ASPA record
- IRR
- 100% registered · 9 of 9 announcements
- Route objects
- 34 naming AS3661
Reputation
Classification and threat
Education University, school or national research and education network.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 446 networks and 1,852 prefixes, as published 2026-10-27. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere