Network · AS40016

AS40016 MESIROW FINANCIAL HOLDINGS, INC.

AS40016 (MESIROW FINANCIAL HOLDINGS, INC.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS40016

OwnerMESIROW FINANCIAL HOLDINGS, INC.
KindInternet service provider
Servers, not peopleno
IPv4 addresses512
IPv4 ranges2
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

207.252.173.0/24
204.153.74.0/24

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

Check an IP address →

Detect it in code

Spot AS40016 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 AS40016

Is AS40016 a datacenter or VPN network?

AS40016 (MESIROW FINANCIAL HOLDINGS, INC.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS40016?

AS40016 is registered to MESIROW FINANCIAL HOLDINGS, INC.. It announces about 512 IPv4 addresses.

How do I detect traffic from AS40016?

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.