Network · AS43404

AS43404 Fastnet LLC

AS43404 (Fastnet LLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS43404

OwnerFastnet LLC
KindInternet service provider
Servers, not peopleno
IPv4 addresses10,240
IPv4 ranges2
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

89.23.32.0/19
77.87.200.0/21

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

Check an IP address →

Detect it in code

Spot AS43404 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 AS43404

Is AS43404 a datacenter or VPN network?

AS43404 (Fastnet LLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS43404?

AS43404 is registered to Fastnet LLC. It announces about 10,240 IPv4 addresses.

How do I detect traffic from AS43404?

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.