Network · AS57866

AS57866 Fusix Networks B.V.

AS57866 (Fusix Networks B.V.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS57866

OwnerFusix Networks B.V.
KindInternet service provider
Servers, not peopleno
IPv4 addresses9,728
IPv4 ranges16
IPv6 ranges5

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

37.139.136.0/21
45.149.8.0/22
45.141.104.0/22
193.187.120.0/22
185.52.236.0/22
185.242.64.0/22
85.208.60.0/24
46.226.126.0/24
45.88.65.0/24
212.18.112.0/24
185.43.34.0/24
185.30.206.0/24

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-22.

Check an IP address →

Detect it in code

Spot AS57866 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 AS57866

Is AS57866 a datacenter or VPN network?

AS57866 (Fusix Networks B.V.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS57866?

AS57866 is registered to Fusix Networks B.V.. It announces about 9,728 IPv4 addresses.

How do I detect traffic from AS57866?

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.