Network · AS51155

AS51155 Citylink Telecom Sp. Z.o.o.

AS51155 (Citylink Telecom Sp. Z.o.o.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS51155

OwnerCitylink Telecom Sp. Z.o.o.
KindInternet service provider
Servers, not peopleno
IPv4 addresses5,120
IPv4 ranges2
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

178.19.176.0/20
46.227.36.0/22

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

Check an IP address →

Detect it in code

Spot AS51155 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 AS51155

Is AS51155 a datacenter or VPN network?

AS51155 (Citylink Telecom Sp. Z.o.o.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS51155?

AS51155 is registered to Citylink Telecom Sp. Z.o.o.. It announces about 5,120 IPv4 addresses.

How do I detect traffic from AS51155?

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.