Network · AS36221

AS36221 Esosoft Corporation

AS36221 (Esosoft Corporation) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS36221

OwnerEsosoft Corporation
KindInternet service provider
Servers, not peopleno
IPv4 addresses1,792
IPv4 ranges5
IPv6 ranges6

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

66.241.158.0/23
66.241.144.0/23
66.241.150.0/24
66.241.148.0/24
66.241.146.0/24

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

Check an IP address →

Detect it in code

Spot AS36221 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 AS36221

Is AS36221 a datacenter or VPN network?

AS36221 (Esosoft Corporation) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS36221?

AS36221 is registered to Esosoft Corporation. It announces about 1,792 IPv4 addresses.

How do I detect traffic from AS36221?

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.