Network · AS3300

AS3300 British Telecommunications PLC

AS3300 (British Telecommunications PLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS3300

  • OwnerBritish Telecommunications PLC
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses513,024
  • IPv4 ranges50
  • IPv6 ranges34
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 209.28.0.0/16
  • 207.209.0.0/16
  • 207.117.0.0/16
  • 206.182.0.0/16
  • 205.248.0.0/16
  • 63.250.128.0/18
  • 61.14.0.0/18
  • 204.231.128.0/18
  • 204.231.0.0/18
  • 204.140.64.0/18
  • 199.6.64.0/18
  • 198.207.64.0/18

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

Check an IP address →

Detect it in code

Spot AS3300 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 AS3300

Is AS3300 a datacenter or VPN network?

AS3300 (British Telecommunications PLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS3300?

AS3300 is registered to British Telecommunications PLC. It announces about 513,024 IPv4 addresses.

How do I detect traffic from AS3300?

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.