Network · AS40509

AS40509 Fly.io, Inc.

AS40509 (Fly.io, Inc.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS40509

  • OwnerFly.io, Inc.
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses76,288
  • IPv4 ranges34
  • IPv6 ranges25
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 37.16.0.0/19
  • 213.188.192.0/19
  • 149.248.192.0/19
  • 137.66.0.0/19
  • 209.71.96.0/20
  • 209.71.80.0/20
  • 169.155.48.0/20
  • 168.220.80.0/20
  • 137.66.48.0/20
  • 66.51.120.0/21
  • 209.71.64.0/21
  • 188.93.144.0/21

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-22.

Check an IP address →

Detect it in code

Spot AS40509 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 AS40509

Is AS40509 a datacenter or VPN network?

AS40509 (Fly.io, Inc.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS40509?

AS40509 is registered to Fly.io, Inc.. It announces about 76,288 IPv4 addresses.

How do I detect traffic from AS40509?

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.