Network · AS19739

AS19739 County of San Bernardino

AS19739 (County of San Bernardino) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS19739

  • OwnerCounty of San Bernardino
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses10,496
  • IPv4 ranges21
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 170.164.240.0/21
  • 170.164.40.0/22
  • 170.164.116.0/22
  • 170.164.84.0/23
  • 170.164.70.0/23
  • 170.164.44.0/23
  • 170.164.248.0/23
  • 170.164.20.0/23
  • 170.164.124.0/23
  • 170.164.10.0/23
  • 170.164.97.0/24
  • 170.164.87.0/24

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

Check an IP address →

Detect it in code

Spot AS19739 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 AS19739

Is AS19739 a datacenter or VPN network?

AS19739 (County of San Bernardino) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS19739?

AS19739 is registered to County of San Bernardino. It announces about 10,496 IPv4 addresses.

How do I detect traffic from AS19739?

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.