Autonomous system
AS4158 CITYUNI-AS-AP City University of Hong Kong
Education APNIC
Summary
City University of Hong Kong
education university research legacy
CITYUNI-AS-AP is City University of Hong Kong (CityU), a public research university in Kowloon Tong, Hong Kong.
What it's used for
- Campus networking for students, faculty, and staff: teaching, research, library, residence halls, and administrative systems.
- Research and inter-university connectivity within Hong Kong's academic networking community.
Notable
- This is institutional address space. Traffic from it is overwhelmingly campus users rather than commercial subscribers or hosted customers.
- The allocation is sizeable for a single campus (tens of thousands of addresses), reflecting an era when universities received generous IPv4 assignments.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 9 prefixes · 82.98K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| HK | Hong Kong | 10 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS4158- Registry name
- CITYUNI-AS-AP
- Registrant
- City University of Hong Kong
- Abuse contact
- ccnet@cityu.edu.hk
- Registered
- 2008-09-04
- Last changed
- 2022-10-10
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- City University of Hong Kong
- Scope
- Not Disclosed
- Traffic ratio
- Not Disclosed
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, 11 with no ROA
- ROAs
- 0 authorising AS4158
- ASPA
- no ASPA record
- IRR
- 82% registered · 9 of 11 announcements
- Route objects
- 20 naming AS4158
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: 432 networks and 1,768 prefixes, as published 2026-10-12. 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