Network · AS15518

AS15518 Circular Informationssysteme GmbH

AS15518 (Circular Informationssysteme GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS15518

OwnerCircular Informationssysteme GmbH
KindInternet service provider
Servers, not peopleno
IPv4 addresses7,936
IPv4 ranges6
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

212.86.160.0/20
213.153.72.0/22
212.86.188.0/22
212.86.180.0/22
213.153.64.0/23
213.153.67.0/24

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

Check an IP address →

Detect it in code

Spot AS15518 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 AS15518

Is AS15518 a datacenter or VPN network?

AS15518 (Circular Informationssysteme GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS15518?

AS15518 is registered to Circular Informationssysteme GmbH. It announces about 7,936 IPv4 addresses.

How do I detect traffic from AS15518?

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.