Network · AS21743

AS21743 Atlas Networks Corporation

AS21743 (Atlas Networks Corporation) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS21743

OwnerAtlas Networks Corporation
KindInternet service provider
Servers, not peopleno
IPv4 addresses20,480
IPv4 ranges21
IPv6 ranges2

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

66.171.176.0/20
66.170.184.0/21
199.231.240.0/21
149.57.248.0/21
69.5.52.0/22
154.6.48.0/22
149.18.8.0/22
104.36.44.0/22
104.255.0.0/22
104.247.120.0/22
104.192.204.0/22
209.200.234.0/23

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

Check an IP address →

Detect it in code

Spot AS21743 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 AS21743

Is AS21743 a datacenter or VPN network?

AS21743 (Atlas Networks Corporation) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS21743?

AS21743 is registered to Atlas Networks Corporation. It announces about 20,480 IPv4 addresses.

How do I detect traffic from AS21743?

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.