Autonomous system
AS9891 CSLOX-IDC-AS-AP CS LOXINFO Public Company Limited.
Hosting APNIC
Summary
CS LoxInfo (IDC)
hosting isp legacy
AS9891 (CSLOX-IDC-AS-AP) is held by CS LoxInfo Public Company Limited (CSL), a Bangkok-based ICT provider founded in 1994 and part of the AIS group since 2018. As the handle says, this is CSL's Internet Data Center AS — the network behind its hosting, colocation and cloud business, rather than its consumer access network.
What it's used for
The routing evidence is unusually self-consistent. RIS sees 102 IPv4 prefixes carrying 51,712 addresses, 7 IPv6 prefixes, and 7 observed BGP neighbours. Fifty thousand addresses with only seven neighbours is not a carrier — a wholesale transit business of that address size would peer with hundreds of networks. It is a hosting estate: a large pool of addresses handed out to servers, reached through a small number of upstreams. The reverse DNS confirms it directly. Sampled addresses resolve as idc-27-254-60-5.csloxinfo.com and reverse-203-172-40-5.csloxinfo.net — the operator's own generated hosting PTRs — mixed with customer-configured names on individual servers (ns1.pimjob.com, linux.psquare.co.th). Machine-generated idc- PTRs alongside bespoke customer hostnames is what a shared data centre looks like from the outside.
Notable
- The bulk of the space is drawn from
27.254.0.0/16, announced as dozens of /21s and /22s — the classic pattern of a hosting provider slicing one large allocation into per-rack or per-product blocks. - CSL operates data centres in several Thai regions, so addresses in this AS are not necessarily in Bangkok even though the company is headquartered there.
- IPv6 is deployed across several ranges including
2404:b1::/32and2400:b5c0::/32. - This is the IDC network specifically; CSL's other business lines sit behind different ASNs, so do not read consumer broadband into addresses seen here.
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 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 94 prefixes · 48.64K addresses IPv6 11 prefixes
| Country | Name | Prefixes |
|---|---|---|
| TH | Thailand | 105 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9891- Registry name
- CSLOX-IDC-AS-AP
- Registrant
- CS Loxinfo Public Company Limited
- Abuse contact
- csl-ip-admin@ais.co.th
- Registered
- 2008-09-04
- Last changed
- 2020-07-07
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 91% valid · 104 valid, 8 with no ROA 2 RPKI-invalid
- ROAs
- 110 authorising AS9891
- ASPA
- no ASPA record
- IRR
- 99.1% registered · 113 of 114 announcements
- Route objects
- 204 naming AS9891
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
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: 442 networks and 1,773 prefixes, as published 2026-10-13. 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