210.40.0.0/13

CERNET-CN IPv4 China ALLOCATED PORTABLE AS4538

Registration

APNIC

Range: 210.40.0.0 to 210.47.255.255
CIDR: 210.40.0.0/13
Addresses: 524,288
Net name: CERNET-CN
Description: China Education and Research Network China Education and Research Network Center Tsinghua University Beijing, 100084
Holder: Not published
Status: ALLOCATED PORTABLE
Abuse contact: Not published
Last updated: 2026-04-26

Routing

Covered by 210.40.0.0/24 from AS4538 China Education and Research Network Center. RPKI valid

More specific assignments

No smaller assignments inside this range.

WHOIS

inetnum:        210.40.0.0 - 210.47.255.255
netname:        CERNET-CN
descr:          China Education and Research Network
descr:          China Education and Research Network Center
descr:          Tsinghua University
descr:          Beijing, 100084
country:        CN
status:         ALLOCATED PORTABLE
source:         APNIC

Location of the first address

Beijing, China

City named in registry record

Report wrong location

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/network/210.40.0.0/13

const res = await fetch('https://ip-fd.net/api/v1/network/210.40.0.0/13', {
  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/network/210.40.0.0/13', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/network/210.40.0.0/13');
curl_setopt($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/network/210.40.0.0/13", 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))

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