Network · AS166

AS166 Institute for Defense Analyses

AS166 (Institute for Defense Analyses) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS166

OwnerInstitute for Defense Analyses
KindInternet service provider
Servers, not peopleno
IPv4 addresses131,328
IPv4 ranges3
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

164.217.0.0/16
129.246.0.0/16
198.133.241.0/24

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

Check an IP address →

Detect it in code

Spot AS166 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 AS166

Is AS166 a datacenter or VPN network?

AS166 (Institute for Defense Analyses) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS166?

AS166 is registered to Institute for Defense Analyses. It announces about 131,328 IPv4 addresses.

How do I detect traffic from AS166?

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.