Network · AS401851

AS401851 County of San Diego

AS401851 (County of San Diego) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS401851

  • OwnerCounty of San Diego
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses3,584
  • IPv4 ranges7
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 170.213.4.0/22
  • 170.213.22.0/23
  • 170.213.2.0/23
  • 170.213.18.0/23
  • 170.213.132.0/23
  • 209.77.1.0/24
  • 170.213.131.0/24

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

Check an IP address →

Detect it in code

Spot AS401851 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 AS401851

Is AS401851 a datacenter or VPN network?

AS401851 (County of San Diego) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS401851?

AS401851 is registered to County of San Diego. It announces about 3,584 IPv4 addresses.

How do I detect traffic from AS401851?

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.