Network · AS21700

AS21700 Neptune Networks, LLC

AS21700 (Neptune Networks, LLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS21700

OwnerNeptune Networks, LLC
KindInternet service provider
Servers, not peopleno
IPv4 addresses2,816
IPv4 ranges7
IPv6 ranges2

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

209.151.100.0/22
172.82.22.0/23
23.157.160.0/24
216.74.121.0/24
216.126.57.0/24
192.109.165.0/24
157.254.142.0/24

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

Check an IP address →

Detect it in code

Spot AS21700 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 AS21700

Is AS21700 a datacenter or VPN network?

AS21700 (Neptune Networks, LLC) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS21700?

AS21700 is registered to Neptune Networks, LLC. It announces about 2,816 IPv4 addresses.

How do I detect traffic from AS21700?

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.