Network · AS5400

AS5400 British Telecommunications PLC

AS5400 (British Telecommunications PLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS5400

  • OwnerBritish Telecommunications PLC
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses713,728
  • IPv4 ranges73
  • IPv6 ranges10
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 62.180.0.0/16
  • 62.134.0.0/16
  • 213.15.0.0/16
  • 206.73.0.0/16
  • 195.163.0.0/16
  • 195.100.0.0/16
  • 62.5.0.0/17
  • 62.102.0.0/17
  • 166.49.128.0/17
  • 62.173.192.0/18
  • 213.236.64.0/18
  • 213.194.0.0/18

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

Check an IP address →

Detect it in code

Spot AS5400 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 AS5400

Is AS5400 a datacenter or VPN network?

AS5400 (British Telecommunications PLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS5400?

AS5400 is registered to British Telecommunications PLC. It announces about 713,728 IPv4 addresses.

How do I detect traffic from AS5400?

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.