AS204961 ON4 sp. z o.o.

Poland ON4-AS RIPE 1 IPv4 prefix 1 IPv6 prefix

IPv4 addresses

256

IPv6 /48 networks

RPKI

2 valid0 no ROA

Peers and downstreams

Holder

AS name: ON4-AS
Description: ON4 sp. z o.o.
Organisation: ON4 sp. z o.o.
Abuse contact: abuse@on4.pl
Assigned: 2025-12-08
Registered: 2025-12-09
Record last changed: 2026-03-31 09:01 UTC

193.228.174.0/24

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade B · 85/100

pass	Prefixes covered by valid ROAs 2 of 2 announced prefixes are RPKI valid.	25/25
pass	No RPKI invalid announcements None of the announcements is RPKI invalid.	10/10
pass	Announces IPv6 1 IPv6 prefix.	15/15
partly	More than one upstream 1 upstream seen in BGP.	5/10
pass	Working abuse contact abuse@on4.pl is published.	15/15
fail	Publishes a geofeed No geofeed found. Without one, location databases have to guess.	0/10
pass	No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger.	10/10
pass	Registry record maintained Last changed 2026-03-31.	5/5

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/204961"><img src="https://ip-fd.net/badge/asn/204961/health.svg" alt="AS204961 network health on IP-FD.net"></a>

Markdown

[![AS204961 network health](https://ip-fd.net/badge/asn/204961/health.svg)](https://ip-fd.net/asn/204961)

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

Routing changes

Last 30 days

2026-10-04 19:45 UTC	Relationship changed	AS6204	upstream to peer
2026-10-04 19:45 UTC	Relationship changed	AS5617	upstream to peer
2026-10-04 19:45 UTC	New neighbour	AS33891	peer
2026-10-04 19:45 UTC	Relationship changed	AS201054	upstream to peer

WHOIS

aut-num:        AS204961
as-name:        ON4-AS
org:            ORG-OSZO48-RIPE
sponsoring-org: ORG-TS16-RIPE
admin-c:        IG346-RIPE
tech-c:         PB26251-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MNT-EXATEL
created:        2025-12-09T08:20:50Z
last-modified:  2026-03-31T09:01:28Z
source:         RIPE
% 6 routing policy lines (import/export) not shown

Routing data

Updated just now

Registry record

Fetched just now from RIPE

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/204961

const res = await fetch('https://ip-fd.net/api/v1/asn/204961', {
  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/204961', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/204961');
curl_setopt($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/204961", 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.

AS5617	Tpnet TPNET
AS6204	TMRC GROUP SRL ZET-NET
AS24482	SG.GS SGGS-AS-AP
AS28917	Fiord Networks, UAB Fiord-AS
AS33891	Core-Backbone GmbH CORE-BACKBONE
AS49544	i3D.net B.V i3Dnet
AS201054	Stowarzyszenie e-Poludnie EPIX-PolMix