Network · AS20743

AS20743 SIX Swiss Exchange AG

AS20743 (SIX Swiss Exchange AG) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS20743

OwnerSIX Swiss Exchange AG
KindInternet service provider
Servers, not peopleno
IPv4 addresses8,704
IPv4 ranges3
IPv6 ranges2

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

146.109.160.0/19
146.109.153.0/24
146.109.145.0/24

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

Check an IP address →

Detect it in code

Spot AS20743 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 AS20743

Is AS20743 a datacenter or VPN network?

AS20743 (SIX Swiss Exchange AG) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS20743?

AS20743 is registered to SIX Swiss Exchange AG. It announces about 8,704 IPv4 addresses.

How do I detect traffic from AS20743?

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.