Network · AS23600

AS23600 Korea Internet Security Agency

AS23600 (Korea Internet Security Agency) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23600

OwnerKorea Internet Security Agency
KindInternet service provider
Servers, not peopleno
IPv4 addresses4,096
IPv4 ranges13
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

1.18.132.0/22
58.235.102.0/24
39.127.249.0/24
39.125.244.0/24
39.125.228.0/24
39.125.192.0/24
221.139.191.0/24
219.251.156.0/24
219.251.142.0/24
203.83.158.0/24
202.31.190.0/24
202.31.188.0/24

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

Check an IP address →

Detect it in code

Spot AS23600 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 AS23600

Is AS23600 a datacenter or VPN network?

AS23600 (Korea Internet Security Agency) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23600?

AS23600 is registered to Korea Internet Security Agency. It announces about 4,096 IPv4 addresses.

How do I detect traffic from AS23600?

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.