Autonomous system
AS23875 CSL-AS-AP CSL Limited
Unclassified APNIC
Summary
CSL Limited
telecom business hong-kong
CSL-AS-AP is operated by CSL Limited, a telecommunications provider based in Hong Kong.
What it's used for
- The address space carries corporate and enterprise traffic, evidenced by netnames
CSL-NETandPCCWG-APAC-AS-APassociated with CSL Limited and PCCW Global (HK) Limited. - The AS announces 1792 IPv4 addresses across 7 prefixes with 7 observed neighbours, indicating a role focused on internal corporate connectivity and specific service delivery rather than large-scale residential access or transit.
Notable
- Registrants include both CSL Limited and PCCW Global (HK) Limited, reflecting the corporate relationship between the two entities within the PCCW Group.
- The address inventory is composed of seven /24 blocks, with four registered to PCCW Global and three to CSL Limited, all located in Hong Kong.
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 | 123.255.91.54 |
Transit providers
5 upstream, 0 downstream and 5 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 2026-10-25, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 1.79K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| HK | Hong Kong | 7 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS23875- Registry name
- CSL-AS-AP
- Registrant
- CSL Limited
- Abuse contact
- henry.ts.yang@hkcsl.com
- Registered
- 2008-09-04
- Last changed
- 2020-06-22
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 43% valid · 3 valid, 3 with no ROA 1 RPKI-invalid
- ROAs
- 3 authorising AS23875
- ASPA
- no ASPA record
- IRR
- 86% registered · 6 of 7 announcements 1 other origin
- Route objects
- 7 naming AS23875
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
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: 443 networks and 1,779 prefixes, as published 2026-10-24. 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