Network · AS51265

AS51265 Mass Response Service GmbH

AS51265 (Mass Response Service GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS51265

  • OwnerMass Response Service GmbH
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses52,992
  • IPv4 ranges9
  • IPv6 ranges1
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 41.66.64.0/18
  • 197.211.128.0/18
  • 83.216.32.0/19
  • 62.240.128.0/19
  • 185.69.244.0/22
  • 185.44.52.0/22
  • 178.157.4.0/22
  • 193.9.252.0/23
  • 176.126.39.0/24

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

Check an IP address →

Detect it in code

Spot AS51265 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 AS51265

Is AS51265 a datacenter or VPN network?

AS51265 (Mass Response Service GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS51265?

AS51265 is registered to Mass Response Service GmbH. It announces about 52,992 IPv4 addresses.

How do I detect traffic from AS51265?

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.