Network · AS23397

AS23397 Chicago Mercantile Exchange

AS23397 (Chicago Mercantile Exchange) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS23397

OwnerChicago Mercantile Exchange
KindInternet service provider
Servers, not peopleno
IPv4 addresses512
IPv4 ranges2
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

204.10.10.0/24
167.204.37.0/24

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

Check an IP address →

Detect it in code

Spot AS23397 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 AS23397

Is AS23397 a datacenter or VPN network?

AS23397 (Chicago Mercantile Exchange) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS23397?

AS23397 is registered to Chicago Mercantile Exchange. It announces about 512 IPv4 addresses.

How do I detect traffic from AS23397?

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.