Network · AS21633

AS21633 U.S. Department of the Interior

AS21633 (U.S. Department of the Interior) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS21633

  • OwnerU.S. Department of the Interior
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses2,816
  • IPv4 ranges4
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 137.227.192.0/21
  • 205.173.4.0/24
  • 205.173.0.0/24
  • 199.5.233.0/24

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

Check an IP address →

Detect it in code

Spot AS21633 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 AS21633

Is AS21633 a datacenter or VPN network?

AS21633 (U.S. Department of the Interior) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS21633?

AS21633 is registered to U.S. Department of the Interior. It announces about 2,816 IPv4 addresses.

How do I detect traffic from AS21633?

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.