Network · AS2504

AS2504 Kyoto University

AS2504 (Kyoto University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS2504

OwnerKyoto University
KindInternet service provider
Servers, not peopleno
IPv4 addresses132,096
IPv4 ranges4
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

133.3.0.0/16
130.54.0.0/16
192.50.8.0/23
192.50.24.0/23

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

Check an IP address →

Detect it in code

Spot AS2504 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 AS2504

Is AS2504 a datacenter or VPN network?

AS2504 (Kyoto University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS2504?

AS2504 is registered to Kyoto University. It announces about 132,096 IPv4 addresses.

How do I detect traffic from AS2504?

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.