Network · AS9821

AS9821 Advanced Science and Technology Institute

AS9821 (Advanced Science and Technology Institute) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS9821

OwnerAdvanced Science and Technology Instit
KindInternet service provider
Servers, not peopleno
IPv4 addresses9,216
IPv4 ranges2
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

202.90.128.0/19
103.80.140.0/22

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

Check an IP address →

Detect it in code

Spot AS9821 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 AS9821

Is AS9821 a datacenter or VPN network?

AS9821 (Advanced Science and Technology Institute) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS9821?

AS9821 is registered to Advanced Science and Technology Institute. It announces about 9,216 IPv4 addresses.

How do I detect traffic from AS9821?

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.