Network · AS4

AS4 University of Southern California

AS4 (University of Southern California) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS4

  • OwnerUniversity of Southern California
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses66,304
  • IPv4 ranges15
  • IPv6 ranges3
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 128.9.128.0/17
  • 128.9.64.0/18
  • 128.9.32.0/19
  • 128.9.0.0/20
  • 128.9.28.0/22
  • 128.9.16.0/22
  • 170.79.218.0/23
  • 165.140.12.0/23
  • 206.117.6.0/24
  • 206.117.37.0/24
  • 206.117.31.0/24
  • 206.117.27.0/24

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

Check an IP address →

Detect it in code

Spot AS4 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 AS4

Is AS4 a datacenter or VPN network?

AS4 (University of Southern California) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS4?

AS4 is registered to University of Southern California. It announces about 66,304 IPv4 addresses.

How do I detect traffic from AS4?

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.