Network · AS5723

AS5723 Johns Hopkins University

AS5723 (Johns Hopkins University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS5723

OwnerJohns Hopkins University
KindInternet service provider
Servers, not peopleno
IPv4 addresses135,680
IPv4 ranges7
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

162.129.0.0/16
128.220.0.0/16
198.57.32.0/21
204.124.184.0/22
198.57.40.0/22
192.12.14.0/24
192.12.13.0/24

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

Check an IP address →

Detect it in code

Spot AS5723 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 AS5723

Is AS5723 a datacenter or VPN network?

AS5723 (Johns Hopkins University) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS5723?

AS5723 is registered to Johns Hopkins University. It announces about 135,680 IPv4 addresses.

How do I detect traffic from AS5723?

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.