Network · AS9903

AS9903 Internet Thailand Company Ltd.

AS9903 (Internet Thailand Company Ltd.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS9903

  • OwnerInternet Thailand Company Ltd.
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses11,520
  • IPv4 ranges8
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 203.158.96.0/20
  • 203.158.248.0/21
  • 203.158.120.0/21
  • 203.158.240.0/22
  • 203.158.112.0/22
  • 203.158.116.0/23
  • 202.44.130.0/23
  • 203.158.119.0/24

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

Check an IP address →

Detect it in code

Spot AS9903 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 AS9903

Is AS9903 a datacenter or VPN network?

AS9903 (Internet Thailand Company Ltd.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS9903?

AS9903 is registered to Internet Thailand Company Ltd.. It announces about 11,520 IPv4 addresses.

How do I detect traffic from AS9903?

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.