Network · AS23631

AS23631 Sofu System, Inc

AS23631 (Sofu System, Inc) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23631

OwnerSofu System, Inc
KindInternet service provider
Servers, not peopleno
IPv4 addresses6,144
IPv4 ranges2
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

210.236.208.0/20
202.243.120.0/21

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

Check an IP address →

Detect it in code

Spot AS23631 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 AS23631

Is AS23631 a datacenter or VPN network?

AS23631 (Sofu System, Inc) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23631?

AS23631 is registered to Sofu System, Inc. It announces about 6,144 IPv4 addresses.

How do I detect traffic from AS23631?

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.