Network · AS28571

AS28571 UNIVERSIDADE DE SAO PAULO

AS28571 (UNIVERSIDADE DE SAO PAULO) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS28571

OwnerUNIVERSIDADE DE SAO PAULO
KindInternet service provider
Servers, not peopleno
IPv4 addresses154,624
IPv4 ranges16
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

143.107.0.0/16
177.90.128.0/17
200.144.192.0/18
177.90.64.0/18
200.144.160.0/19
200.17.16.0/20
200.144.48.0/20
200.136.0.0/20
200.18.108.0/23
200.18.106.0/23
200.144.72.0/23
200.136.52.0/23

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

Check an IP address →

Detect it in code

Spot AS28571 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 AS28571

Is AS28571 a datacenter or VPN network?

AS28571 (UNIVERSIDADE DE SAO PAULO) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS28571?

AS28571 is registered to UNIVERSIDADE DE SAO PAULO. It announces about 154,624 IPv4 addresses.

How do I detect traffic from AS28571?

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.