AS201594 Ctu_As4

Czechia CTU_AS4 RIPE 1 IPv4 prefix 1 IPv6 prefix

IPv4 addresses

256

IPv6 /48 networks

65,536

RPKI

0 valid2 no ROA

Peers and downstreams

Holder

AS name: CTU_AS4
Description: NIX.CZ NIX.CZ
Organisation: Czech Telecommunication Office
Registered in: Prague, Czechia
Abuse contact: schmieds@ctu.cz
Assigned: 2014-09-11
Registered: 2014-09-12
Record last changed: 2025-07-04 09:49 UTC

185.68.215.0/24

Routing changes

Last 30 days

2026-10-04 01:23 UTC	Relationship changed	AS8218	upstream to peer
2026-10-04 01:23 UTC	Relationship changed	AS6663	upstream to peer
2026-10-04 01:23 UTC	Relationship changed	AS6204	upstream to peer
2026-10-04 01:23 UTC	Relationship changed	AS4455	upstream to peer
2026-10-04 01:23 UTC	Relationship changed	AS22356	upstream to peer
2026-10-04 01:23 UTC	Relationship changed	AS1764	upstream to peer
2026-10-04 01:23 UTC	Relationship changed	AS14840	upstream to peer

WHOIS

aut-num:        AS201594
as-name:        CTU_AS4
org:            ORG-CTO1-RIPE
admin-c:        SS41216-RIPE
tech-c:         JK16414-RIPE
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         SUPER-CTU
descr:          NIX.CZ
descr:          NIX.CZ
status:         ASSIGNED
created:        2014-09-12T09:04:28Z
last-modified:  2025-07-04T09:49:59Z
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/201594

const res = await fetch('https://ip-fd.net/api/v1/asn/201594', {
  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/201594', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/201594');
curl_setopt($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/201594", 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.

AS6939	Hurricane Electric LLC HURRICANE
AS25248	RADIOKOMUNIKACE a.s. BlueTone-AS

AS1764	Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH NEXTLAYER-AS
AS4455	IX Reach Ltd BSO
AS6204	TMRC GROUP SRL ZET-NET
AS6663	Euroweb Romania S.R.L. TTI-NET
AS6881	NIX.CZ z.s.p.o. NIXCZ
AS8218	Zayo Infrastructure France SA NEO-ASN
AS14840	BR.Digital Telecom AS14840
AS22356	Durand do Brasil Ltda AS22356
AS24482	SG.GS SGGS-AS-AP
AS29504	Freenet Liberec, z.s. LBCFREE
AS36236	NetActuate, Inc NETACTUATE
AS40994	Hohl IT e.U. Alwyzon
AS49544	i3D.net B.V i3Dnet
AS51184	Fonira Telekom GmbH FONIRA
AS198150	SIACOM JSC SIACOM-AS
AS212483	LEVEL EIGHTY-SIX COMMUNICATIONS LTD level86