Network · AS23581

AS23581 Hynix Semiconductor Inc.

AS23581 (Hynix Semiconductor Inc.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23581

  • OwnerHynix Semiconductor Inc.
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses4,096
  • IPv4 ranges10
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 166.125.240.0/22
  • 166.125.252.0/23
  • 166.125.250.0/23
  • 166.125.244.0/23
  • 166.125.254.0/24
  • 166.125.248.0/24
  • 166.125.246.0/24
  • 166.125.239.0/24
  • 166.125.230.0/24
  • 166.125.0.0/24

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

Check an IP address →

Detect it in code

Spot AS23581 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 AS23581

Is AS23581 a datacenter or VPN network?

AS23581 (Hynix Semiconductor Inc.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23581?

AS23581 is registered to Hynix Semiconductor Inc.. It announces about 4,096 IPv4 addresses.

How do I detect traffic from AS23581?

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.