Network · AS23875

AS23875 CSL Limited

AS23875 (CSL Limited) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23875

OwnerCSL Limited
KindInternet service provider
Servers, not peopleno
IPv4 addresses1,792
IPv4 ranges7
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

63.216.62.0/24
63.216.61.0/24
63.216.59.0/24
203.29.222.0/24
202.6.94.0/24
202.164.27.0/24
103.17.29.0/24

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-21.

Check an IP address →

Detect it in code

Spot AS23875 traffic at signup.

Send the visitor's IP. The response includes the ASN, the owner and flags.hosting.

curl https://veqen-app.com/v1/ip/check \
  -H "Authorization: Bearer $VEQEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"ip": "203.0.113.7"}'

import os, requests

r = requests.post(
    "https://veqen-app.com/v1/ip/check",
    headers={"Authorization": f"Bearer {os.environ['VEQEN_API_KEY']}"},
    json={"ip": "203.0.113.7"},
    timeout=10,
)
result = r.json()
print(result["risk"]["verdict"], result["risk"]["reasons"])

const res = await fetch("https://veqen-app.com/v1/ip/check", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.VEQEN_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"ip": "203.0.113.7"}),
});
const result = await res.json();
console.log(result.risk.verdict, result.risk.reasons);

Questions

About AS23875

Is AS23875 a datacenter or VPN network?

AS23875 (CSL Limited) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23875?

AS23875 is registered to CSL Limited. It announces about 1,792 IPv4 addresses.

How do I detect traffic from AS23875?

Call the Veqen IP check with the visitor's address. The response includes the ASN, the owner and whether the network is a datacenter, VPN network, relay or ISP.