Network · AS23817

AS23817 Fujitsu Limited.

AS23817 (Fujitsu Limited.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23817

OwnerFujitsu Limited.
KindInternet service provider
Servers, not peopleno
IPv4 addresses8,192
IPv4 ranges2
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

210.158.128.0/20
202.211.64.0/20

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

Check an IP address →

Detect it in code

Spot AS23817 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 AS23817

Is AS23817 a datacenter or VPN network?

AS23817 (Fujitsu Limited.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23817?

AS23817 is registered to Fujitsu Limited.. It announces about 8,192 IPv4 addresses.

How do I detect traffic from AS23817?

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.