AS5723 Johns Hopkins University

United States AS5723 ARIN 8 IPv4 prefixes 1 IPv6 prefix

IPv4 addresses

135,680

IPv6 /48 networks

65,536

RPKI

9 valid0 no ROA

Peers and downstreams

Holder

AS name: AS5723
Description: Hopkins Information Technology Services 3400 North Charles Street Garland Hall, Suite 020 Baltimore MD 21218 United States
Organisation: Johns Hopkins University
Abuse contact: Not published
Assigned: 1995-09-05
Registered: 1995-09-06
Record last changed: 2020-09-08 23:24 UTC

128.220.0.0/16 162.129.0.0/16 192.12.13.0/24 192.12.14.0/24 198.57.32.0/21 198.57.39.0/24 198.57.40.0/22 204.124.184.0/22

Routing changes

Last 30 days

2026-10-04 06:58 UTC	Neighbour gone	AS396450	upstream
2026-10-04 06:58 UTC	Relationship changed	AS10886	upstream to peer
2026-10-04 06:58 UTC	Prefix gone	128.220.122.0/24

WHOIS

aut-num:        AS5723
as-name:        JHU
handle:         AS5723
registrant:     JHU-Z (Johns Hopkins University)
last changed:   2020-09-08T19:24:15-04:00
registration:   1995-09-06T00:00:00-04:00
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/5723

const res = await fetch('https://ip-fd.net/api/v1/asn/5723', {
  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/5723', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/5723');
curl_setopt($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/5723", 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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