Network · AS3527

AS3527 National Institutes of Health

AS3527 (National Institutes of Health) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS3527

OwnerNational Institutes of Health
KindInternet service provider
Servers, not peopleno
IPv4 addresses325,632
IPv4 ranges52
IPv6 ranges5

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

157.98.0.0/16
137.187.0.0/16
128.231.0.0/16
156.40.128.0/18
165.112.64.0/19
165.112.160.0/19
162.99.224.0/19
156.40.0.0/19
165.112.96.0/20
165.112.48.0/20
165.112.224.0/20
165.112.208.0/20

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

Check an IP address →

Detect it in code

Spot AS3527 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 AS3527

Is AS3527 a datacenter or VPN network?

AS3527 (National Institutes of Health) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS3527?

AS3527 is registered to National Institutes of Health. It announces about 325,632 IPv4 addresses.

How do I detect traffic from AS3527?

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.