Network · AS25921

AS25921 LUS Fiber

AS25921 (LUS Fiber) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS25921

OwnerLUS Fiber
KindInternet service provider
Servers, not peopleno
IPv4 addresses60,160
IPv4 ranges12
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

76.72.0.0/17
74.80.0.0/18
69.1.176.0/20
69.1.168.0/21
69.1.160.0/22
12.166.220.0/22
12.166.208.0/22
69.1.166.0/23
12.166.218.0/23
65.125.93.0/24
12.152.126.0/24
12.152.107.0/24

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

Check an IP address →

Detect it in code

Spot AS25921 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 AS25921

Is AS25921 a datacenter or VPN network?

AS25921 (LUS Fiber) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS25921?

AS25921 is registered to LUS Fiber. It announces about 60,160 IPv4 addresses.

How do I detect traffic from AS25921?

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.