Network · AS18305

AS18305 POSCO DX

AS18305 (POSCO DX) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS18305

  • OwnerPOSCO DX
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses75,264
  • IPv4 ranges43
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 203.245.128.0/17
  • 203.244.64.0/19
  • 203.244.32.0/19
  • 203.241.0.0/19
  • 203.238.192.0/20
  • 203.246.184.0/22
  • 203.238.220.0/22
  • 203.231.144.0/22
  • 211.171.186.0/23
  • 210.113.156.0/23
  • 203.246.188.0/23
  • 203.231.148.0/23

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

Check an IP address →

Detect it in code

Spot AS18305 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 AS18305

Is AS18305 a datacenter or VPN network?

AS18305 (POSCO DX) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS18305?

AS18305 is registered to POSCO DX. It announces about 75,264 IPv4 addresses.

How do I detect traffic from AS18305?

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.