Network · AS12156

AS12156 City of Aurora Colorado

AS12156 (City of Aurora Colorado) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS12156

OwnerCity of Aurora Colorado
KindInternet service provider
Servers, not peopleno
IPv4 addresses1,536
IPv4 ranges5
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

205.167.144.0/23
198.199.188.0/24
198.199.187.0/24
198.148.209.0/24
192.78.99.0/24

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

Check an IP address →

Detect it in code

Spot AS12156 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 AS12156

Is AS12156 a datacenter or VPN network?

AS12156 (City of Aurora Colorado) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS12156?

AS12156 is registered to City of Aurora Colorado. It announces about 1,536 IPv4 addresses.

How do I detect traffic from AS12156?

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.