Network · AS513

AS513 CERN - European Organization for Nuclear Research

AS513 (CERN - European Organization for Nuclear Research) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS513

OwnerCERN - European Organization for Nucle
KindInternet service provider
Servers, not peopleno
IPv4 addresses354,816
IPv4 ranges19
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

188.184.0.0/15
137.138.0.0/16
128.142.0.0/16
128.141.0.0/16
194.12.128.0/18
192.65.184.0/21
192.91.240.0/22
192.91.236.0/22
192.65.192.0/22
192.16.160.0/22
192.16.156.0/22
185.249.56.0/22

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

Check an IP address →

Detect it in code

Spot AS513 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 AS513

Is AS513 a datacenter or VPN network?

AS513 (CERN - European Organization for Nuclear Research) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS513?

AS513 is registered to CERN - European Organization for Nuclear Research. It announces about 354,816 IPv4 addresses.

How do I detect traffic from AS513?

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.