Network · AS3356

AS3356 Level 3 Communications, Inc.

AS3356 (Level 3 Communications, Inc.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS3356

OwnerLevel 3 Communications, Inc.
KindInternet service provider
Servers, not peopleno
IPv4 addresses27,456,516
IPv4 ranges4,355
IPv6 ranges152

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

8.96.0.0/11
4.96.0.0/11
8.80.0.0/12
4.80.0.0/12
4.48.0.0/12
4.0.0.0/12
8.72.0.0/13
8.56.0.0/13
8.248.0.0/13
8.200.0.0/13
4.64.0.0/13
4.40.0.0/13

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

Check an IP address →

Detect it in code

Spot AS3356 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 AS3356

Is AS3356 a datacenter or VPN network?

AS3356 (Level 3 Communications, Inc.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS3356?

AS3356 is registered to Level 3 Communications, Inc.. It announces about 27,456,516 IPv4 addresses.

How do I detect traffic from AS3356?

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.