Network · AS31477

AS31477 Duocast B.V.

AS31477 (Duocast B.V.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS31477

OwnerDuocast B.V.
KindInternet service provider
Servers, not peopleno
IPv4 addresses30,720
IPv4 ranges29
IPv6 ranges22

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

89.188.0.0/19
93.184.96.0/20
89.200.200.0/21
87.238.168.0/21
83.137.144.0/21
37.9.160.0/21
91.196.104.0/22
45.82.188.0/22
194.13.8.0/22
193.138.248.0/22
185.180.96.0/22
91.206.136.0/23

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

Check an IP address →

Detect it in code

Spot AS31477 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 AS31477

Is AS31477 a datacenter or VPN network?

AS31477 (Duocast B.V.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS31477?

AS31477 is registered to Duocast B.V.. It announces about 30,720 IPv4 addresses.

How do I detect traffic from AS31477?

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.