AS204921 zhenyun sun

United Kingdom YunZheng-Network RIPE 8 IPv4 prefixes 12 IPv6 prefixes

IPv4 addresses

1,536

IPv6 /48 networks

RPKI

18 valid2 invalid0 no ROA

Peers and downstreams

Holder

AS name: YunZheng-Network
Description: Yunzheng.Space Research Network
Organisation: zhenyun sun
Abuse contact: noc@as204921.net
Assigned: 2025-10-09

142.249.114.0/24 142.249.115.0/24 177.177.80.0/22 177.177.80.0/23 177.177.80.0/24 177.177.81.0/24 177.177.82.0/23 177.177.83.0/24

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade B · 87/100

partly	Prefixes covered by valid ROAs 18 of 20 announced prefixes are RPKI valid.	23/25
fail	No RPKI invalid announcements 2 announced prefixes are RPKI invalid and dropped by networks that validate.	0/10
pass	Announces IPv6 12 IPv6 prefixes.	15/15
pass	More than one upstream 20 upstreams seen in BGP.	10/10
pass	Working abuse contact noc@as204921.net is published.	15/15
pass	Publishes a geofeed A geofeed (RFC 8805) tells where the address space is used.	10/10
pass	No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger.	10/10
n/a	Registry record maintained We have no change date for this record.

Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.

Show this on your website

HTML

<a href="https://ip-fd.net/asn/204921"><img src="https://ip-fd.net/badge/asn/204921/health.svg" alt="AS204921 network health on IP-FD.net"></a>

Markdown

[![AS204921 network health](https://ip-fd.net/badge/asn/204921/health.svg)](https://ip-fd.net/asn/204921)

Use rpki.svg instead of health.svg for the RPKI badge.

Routing changes

Last 30 days

No changes recorded in the last 30 days. Changes are recorded each time the routing data of this AS is refreshed. Get alerts in real time.

Routing data

From the weekly collection

Registry record

From the nightly import

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/204921

const res = await fetch('https://ip-fd.net/api/v1/asn/204921', {
  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/204921', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/204921');
curl_setopt($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/204921", 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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