Network · AS17621

AS17621 China Unicom Shanghai network

AS17621 (China Unicom Shanghai network) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS17621

  • OwnerChina Unicom Shanghai network
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses837,632
  • IPv4 ranges345
  • IPv6 ranges66
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 139.226.0.0/16
  • 58.246.0.0/17
  • 140.206.0.0/17
  • 139.227.0.0/17
  • 58.247.128.0/18
  • 58.247.0.0/18
  • 27.115.0.0/18
  • 223.167.0.0/18
  • 223.166.0.0/18
  • 220.248.64.0/18
  • 139.227.128.0/18
  • 58.247.64.0/19

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-22.

Check an IP address →

Detect it in code

Spot AS17621 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 AS17621

Is AS17621 a datacenter or VPN network?

AS17621 (China Unicom Shanghai network) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS17621?

AS17621 is registered to China Unicom Shanghai network. It announces about 837,632 IPv4 addresses.

How do I detect traffic from AS17621?

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.