Network · AS103

AS103 Northwestern University

AS103 (Northwestern University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS103

  • OwnerNorthwestern University
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses149,504
  • IPv4 ranges22
  • IPv6 ranges1
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 129.105.0.0/16
  • 165.124.0.0/17
  • 199.74.64.0/18
  • 165.124.192.0/19
  • 165.124.128.0/19
  • 165.124.240.0/20
  • 165.124.160.0/20
  • 165.124.224.0/21
  • 165.124.176.0/21
  • 8.30.248.0/22
  • 165.124.232.0/22
  • 8.28.178.0/23

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

Check an IP address →

Detect it in code

Spot AS103 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 AS103

Is AS103 a datacenter or VPN network?

AS103 (Northwestern University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS103?

AS103 is registered to Northwestern University. It announces about 149,504 IPv4 addresses.

How do I detect traffic from AS103?

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.