Network · AS37

AS37 Navy Network Information Center (NNIC)

AS37 (Navy Network Information Center (NNIC)) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS37

OwnerNavy Network Information Center (NNIC)
KindInternet service provider
Servers, not peopleno
IPv4 addresses69,120
IPv4 ranges8
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

128.38.0.0/16
198.91.64.0/22
199.10.12.0/23
199.10.10.0/23
198.91.72.0/23
198.91.70.0/23
199.10.8.0/24
198.91.69.0/24

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

Check an IP address →

Detect it in code

Spot AS37 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 AS37

Is AS37 a datacenter or VPN network?

AS37 (Navy Network Information Center (NNIC)) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS37?

AS37 is registered to Navy Network Information Center (NNIC). It announces about 69,120 IPv4 addresses.

How do I detect traffic from AS37?

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.