Network · AS21547

AS21547 FirstLight Networks, LLC

AS21547 (FirstLight Networks, LLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS21547

OwnerFirstLight Networks, LLC
KindInternet service provider
Servers, not peopleno
IPv4 addresses64,256
IPv4 ranges54
IPv6 ranges2

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

74.220.224.0/20
72.12.64.0/20
69.49.128.0/20
69.168.0.0/20
64.140.224.0/20
64.140.192.0/20
72.12.88.0/21
69.49.144.0/21
66.231.208.0/21
66.186.184.0/21
66.186.168.0/21
64.140.248.0/21

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

Check an IP address →

Detect it in code

Spot AS21547 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 AS21547

Is AS21547 a datacenter or VPN network?

AS21547 (FirstLight Networks, LLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS21547?

AS21547 is registered to FirstLight Networks, LLC. It announces about 64,256 IPv4 addresses.

How do I detect traffic from AS21547?

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.