Network · AS3743

AS3743 ARCELORMITTAL USA INC.

AS3743 (ARCELORMITTAL USA INC.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS3743

OwnerARCELORMITTAL USA INC.
KindInternet service provider
Servers, not peopleno
IPv4 addresses1,792
IPv4 ranges6
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

156.144.108.0/23
156.144.99.0/24
156.144.51.0/24
156.144.249.0/24
156.144.208.0/24
156.144.100.0/24

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

Check an IP address →

Detect it in code

Spot AS3743 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 AS3743

Is AS3743 a datacenter or VPN network?

AS3743 (ARCELORMITTAL USA INC.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS3743?

AS3743 is registered to ARCELORMITTAL USA INC.. It announces about 1,792 IPv4 addresses.

How do I detect traffic from AS3743?

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.