Network · AS53571

AS53571 PRECISION CASTPARTS CORP

AS53571 (PRECISION CASTPARTS CORP) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS53571

OwnerPRECISION CASTPARTS CORP
KindInternet service provider
Servers, not peopleno
IPv4 addresses3,584
IPv4 ranges4
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

204.155.96.0/21
204.155.108.0/22
204.155.104.0/24
199.181.154.0/24

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

Check an IP address →

Detect it in code

Spot AS53571 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 AS53571

Is AS53571 a datacenter or VPN network?

AS53571 (PRECISION CASTPARTS CORP) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS53571?

AS53571 is registered to PRECISION CASTPARTS CORP. It announces about 3,584 IPv4 addresses.

How do I detect traffic from AS53571?

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.