AS9891 — CSLOX-IDC-AS-AP CS LOXINFO Public Company Limited.
Network type: hosting
AS9891 announces 77 IPv4 prefixes covering 48,640 addresses and 3 IPv6 prefixes.
About this network
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::/32 and 2400: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.
Announced prefixes
- 14.207.141.0/24
- 14.207.142.0/23
- 27.254.26.0/24
- 27.254.32.0/19
- 27.254.64.0/21
- 27.254.80.0/21
- 27.254.92.0/22
- 27.254.96.0/22
- 27.254.108.0/22
- 27.254.128.0/21
- 27.254.136.0/22
- 27.254.143.0/24
- 27.254.144.0/23
- 27.254.148.0/22
- 27.254.154.0/23
- 27.254.156.0/22
- 27.254.160.0/22
- 27.254.169.0/24
- 27.254.170.0/23
- 27.254.172.0/22
- 27.254.208.0/22
- 27.254.212.0/23
- 27.254.216.0/22
- 103.14.24.0/24
- 103.17.127.0/24
- 103.210.152.0/23
- 103.225.168.0/23
- 147.50.224.0/22
- 147.50.228.0/24
- 147.50.230.0/23
- 147.50.232.0/24
- 147.50.234.0/24
- 147.50.236.0/23
- 147.50.239.0/24
- 147.50.241.0/24
- 147.50.246.0/23
- 147.50.248.0/22
- 147.50.254.0/23
- 202.183.164.0/22
- 202.183.192.0/23
- 202.183.198.0/24
- 202.183.247.0/24
- 203.78.131.0/24
- 203.146.21.0/24
- 203.146.26.0/24
- 203.146.43.0/24
- 203.146.61.0/24
- 203.146.101.0/24
- 203.146.102.0/24
- 203.146.111.0/24
- 203.146.117.0/24
- 203.146.127.0/24
- 203.146.129.0/24
- 203.146.140.0/24
- 203.146.151.0/24
- 203.146.161.0/24
- 203.146.170.0/24
- 203.146.180.0/24
- 203.146.215.0/24
- 203.146.248.0/22
- 203.146.253.0/24
- 203.170.129.0/24
- 203.170.145.0/24
- 203.170.160.0/23
- 203.170.190.0/24
- 203.170.192.0/23
- 203.170.203.0/24
- 203.170.204.0/24
- 203.172.40.0/22
- 203.185.188.0/24
- 203.207.63.0/24
- 210.1.11.0/24
- 210.1.31.0/24
- 210.1.51.0/24
- 210.1.52.0/24
- 210.1.58.0/23
- 210.1.60.0/23
- 2400:b5c0::/32
- 2404:b0:2000::/47
- 2404:b1::/32
Upstream networks
- AS7568 CS LOXINFO Public Company Limited.
- AS45265 CSLOXINFO Transit AS with Domestic (National Internet Exchange)
Downstream networks
Adjacent networks
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