Network · AS18403

AS18403 FPT Telecom Company

AS18403 (FPT Telecom Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS18403

OwnerFPT Telecom Company
KindInternet service provider
Servers, not peopleno
IPv4 addresses1,422,080
IPv4 ranges25
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

42.112.0.0/13
118.68.0.0/14
1.52.0.0/14
58.186.0.0/15
183.80.0.0/16
113.22.0.0/16
210.245.0.0/17
183.81.0.0/17
113.23.0.0/17
203.191.8.0/21
43.239.148.0/22
23.208.160.0/22

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

Check an IP address →

Detect it in code

Spot AS18403 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 AS18403

Is AS18403 a datacenter or VPN network?

AS18403 (FPT Telecom Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS18403?

AS18403 is registered to FPT Telecom Company. It announces about 1,422,080 IPv4 addresses.

How do I detect traffic from AS18403?

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.