Network · AS51207

AS51207 Free Mobile SAS

AS51207 (Free Mobile SAS) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS51207

OwnerFree Mobile SAS
KindInternet service provider
Servers, not peopleno
IPv4 addresses1,320,960
IPv4 ranges5
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

78.240.0.0/13
37.168.0.0/13
37.164.0.0/14
37.8.160.0/19
37.1.232.0/21

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

Check an IP address →

Detect it in code

Spot AS51207 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 AS51207

Is AS51207 a datacenter or VPN network?

AS51207 (Free Mobile SAS) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS51207?

AS51207 is registered to Free Mobile SAS. It announces about 1,320,960 IPv4 addresses.

How do I detect traffic from AS51207?

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.