Network · AS57154

AS57154 Stadtwerke Konstanz GmbH

AS57154 (Stadtwerke Konstanz GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS57154

OwnerStadtwerke Konstanz GmbH
KindInternet service provider
Servers, not peopleno
IPv4 addresses16,640
IPv4 ranges7
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

213.152.96.0/19
88.133.248.0/21
5.10.8.0/21
31.47.80.0/21
185.80.168.0/22
185.36.44.0/22
193.102.25.0/24

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

Check an IP address →

Detect it in code

Spot AS57154 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 AS57154

Is AS57154 a datacenter or VPN network?

AS57154 (Stadtwerke Konstanz GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS57154?

AS57154 is registered to Stadtwerke Konstanz GmbH. It announces about 16,640 IPv4 addresses.

How do I detect traffic from AS57154?

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.