Network · AS51561

AS51561 ICUK Computing Services Limited

AS51561 (ICUK Computing Services Limited) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS51561

OwnerICUK Computing Services Limited
KindInternet service provider
Servers, not peopleno
IPv4 addresses72,960
IPv4 ranges37
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

80.209.128.0/18
46.33.128.0/19
46.102.192.0/19
205.157.160.0/19
188.240.160.0/19
80.95.192.0/20
138.124.128.0/20
89.107.24.0/22
5.133.168.0/22
45.93.112.0/22
2.56.84.0/22
185.35.148.0/22

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-22.

Check an IP address →

Detect it in code

Spot AS51561 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 AS51561

Is AS51561 a datacenter or VPN network?

AS51561 (ICUK Computing Services Limited) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS51561?

AS51561 is registered to ICUK Computing Services Limited. It announces about 72,960 IPv4 addresses.

How do I detect traffic from AS51561?

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.