Network · AS17428

AS17428 21Vianet.Co.,Ltd

AS17428 (21Vianet.Co.,Ltd) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS17428

  • Owner21Vianet.Co.,Ltd
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses11,264
  • IPv4 ranges13
  • IPv6 ranges43
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 120.133.240.0/20
  • 120.132.224.0/21
  • 211.148.20.0/22
  • 103.253.204.0/22
  • 211.148.30.0/23
  • 211.148.24.0/23
  • 211.148.18.0/23
  • 211.148.27.0/24
  • 211.148.17.0/24
  • 182.175.127.0/24
  • 120.132.241.0/24
  • 120.132.177.0/24

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

Check an IP address →

Detect it in code

Spot AS17428 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 AS17428

Is AS17428 a datacenter or VPN network?

AS17428 (21Vianet.Co.,Ltd) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS17428?

AS17428 is registered to 21Vianet.Co.,Ltd. It announces about 11,264 IPv4 addresses.

How do I detect traffic from AS17428?

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.