Network · AS1781

AS1781 Korea Advanced Institute of Science and Technology

AS1781 (Korea Advanced Institute of Science and Technology) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS1781

  • OwnerKorea Advanced Institute of Science an
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses90,112
  • IPv4 ranges4
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 143.248.0.0/16
  • 137.68.0.0/18
  • 210.107.128.0/20
  • 192.249.16.0/20

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

Check an IP address →

Detect it in code

Spot AS1781 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 AS1781

Is AS1781 a datacenter or VPN network?

AS1781 (Korea Advanced Institute of Science and Technology) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS1781?

AS1781 is registered to Korea Advanced Institute of Science and Technology. It announces about 90,112 IPv4 addresses.

How do I detect traffic from AS1781?

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.