Network · AS23599

AS23599 Korea Internet Security Agency

AS23599 (Korea Internet Security Agency) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23599

OwnerKorea Internet Security Agency
KindInternet service provider
Servers, not peopleno
IPv4 addresses1,024
IPv4 ranges4
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

203.83.159.0/24
1.18.126.0/24
1.18.125.0/24
1.18.123.0/24

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

Check an IP address →

Detect it in code

Spot AS23599 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 AS23599

Is AS23599 a datacenter or VPN network?

AS23599 (Korea Internet Security Agency) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23599?

AS23599 is registered to Korea Internet Security Agency. It announces about 1,024 IPv4 addresses.

How do I detect traffic from AS23599?

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.