Network · AS203937

AS203937 MAREK BZDZIUCH trading as CYFROTEL Sp. J.

AS203937 (MAREK BZDZIUCH trading as CYFROTEL Sp. J.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS203937

OwnerMAREK BZDZIUCH trading as CYFROTEL Sp.
KindInternet service provider
Servers, not peopleno
IPv4 addresses3,328
IPv4 ranges6
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

185.131.240.0/22
185.119.120.0/22
194.42.118.0/23
185.253.233.0/24
185.216.172.0/24
185.125.4.0/24

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

Check an IP address →

Detect it in code

Spot AS203937 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 AS203937

Is AS203937 a datacenter or VPN network?

AS203937 (MAREK BZDZIUCH trading as CYFROTEL Sp. J.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS203937?

AS203937 is registered to MAREK BZDZIUCH trading as CYFROTEL Sp. J.. It announces about 3,328 IPv4 addresses.

How do I detect traffic from AS203937?

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.