AS3128 University of Wisconsin System

United States UWSysNet ARIN 12 IPv4 prefixes 1 IPv6 prefix

IPv4 addresses

655,616

IPv6 /48 networks

1,048,576

RPKI

13 valid0 no ROA

Peers and downstreams

Holder

AS name: UWSysNet
Description: University of Wisconsin-Madison
Organisation: University of Wisconsin System
Abuse contact: Not published
Assigned: 1993-11-16
Registered: 1993-11-17
Record last changed: 2018-03-07 19:24 UTC

131.210.0.0/16 137.104.0.0/16 137.81.0.0/16 138.49.0.0/16 138.49.160.0/22 139.225.0.0/16 141.233.0.0/16 143.200.0.0/16 143.235.0.0/16 143.236.0.0/16 144.13.0.0/16 192.35.81.0/24

Routing changes

Last 30 days

2026-10-03 22:15 UTC

Relationship changed

AS7018

upstream to peer

WHOIS

aut-num:        AS3128
as-name:        BRUWS-AS3128
handle:         AS3128
registrant:     BRUWS (University of Wisconsin System)
last changed:   2018-03-07T14:24:25-05:00
registration:   1993-11-17T00:00:00-05:00
source:         ARIN (RDAP)

Routing data

Updated just now

Registry record

Fetched just now from ARIN RDAP

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/3128

const res = await fetch('https://ip-fd.net/api/v1/asn/3128', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/3128', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/3128');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/3128", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Works without a key at a lower rate. Get a free key.

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