Network · AS18121

AS18121 Ishikawa Computer Center Co.,LTD.

AS18121 (Ishikawa Computer Center Co.,LTD.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS18121

  • OwnerIshikawa Computer Center Co.,LTD.
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses22,528
  • IPv4 ranges10
  • IPv6 ranges1
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 202.222.32.0/19
  • 219.121.224.0/20
  • 180.94.192.0/20
  • 219.121.240.0/21
  • 180.94.208.0/21
  • 219.121.252.0/23
  • 219.121.250.0/23
  • 103.241.208.0/23
  • 219.121.254.0/24
  • 219.121.248.0/24

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

Check an IP address →

Detect it in code

Spot AS18121 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 AS18121

Is AS18121 a datacenter or VPN network?

AS18121 (Ishikawa Computer Center Co.,LTD.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS18121?

AS18121 is registered to Ishikawa Computer Center Co.,LTD.. It announces about 22,528 IPv4 addresses.

How do I detect traffic from AS18121?

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.