Network · AS11509

AS11509 Tierzero

AS11509 (Tierzero) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS11509

OwnerTierzero
KindInternet service provider
Servers, not peopleno
IPv4 addresses118,528
IPv4 ranges14
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

208.179.0.0/16
64.239.128.0/18
216.31.128.0/18
72.18.0.0/19
66.6.208.0/20
216.116.112.0/21
216.116.104.0/21
216.116.120.0/22
216.116.100.0/22
216.116.96.0/23
216.116.124.0/23
216.116.99.0/24

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

Check an IP address →

Detect it in code

Spot AS11509 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 AS11509

Is AS11509 a datacenter or VPN network?

AS11509 (Tierzero) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS11509?

AS11509 is registered to Tierzero. It announces about 118,528 IPv4 addresses.

How do I detect traffic from AS11509?

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.