Network · AS23237

AS23237 McMaster University

AS23237 (McMaster University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23237

OwnerMcMaster University
KindInternet service provider
Servers, not peopleno
IPv4 addresses66,048
IPv4 ranges3
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

130.113.0.0/16
192.42.6.0/24
192.42.5.0/24

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

Check an IP address →

Detect it in code

Spot AS23237 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 AS23237

Is AS23237 a datacenter or VPN network?

AS23237 (McMaster University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23237?

AS23237 is registered to McMaster University. It announces about 66,048 IPv4 addresses.

How do I detect traffic from AS23237?

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.