AS24971 MasterDC s.r.o.

Czechia MASTER-AS RIPE 33 IPv4 prefixes 13 IPv6 prefixes

IPv4 addresses

58,880

IPv6 /48 networks

1,377,283

RPKI

45 valid1 no ROA

Peers and downstreams

Holder

AS name: MASTER-AS
Description: Czech Republic / www.master.cz e-mail: noc@master.cz
Organisation: MasterDC s.r.o.
Registered in: Brno, Czechia
Abuse contact: abuse@master.cz
Assigned: 2002-06-10
Registered: 2002-06-11
Record last changed: 2026-09-22 11:58 UTC

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade B · 89/100

partly	Prefixes covered by valid ROAs 45 of 46 announced prefixes are RPKI valid, 1 have no ROA.	24/25
pass	No RPKI invalid announcements None of the announcements is RPKI invalid.	10/10
pass	Announces IPv6 13 IPv6 prefixes.	15/15
pass	More than one upstream 3 upstreams seen in BGP.	10/10
pass	Working abuse contact abuse@master.cz 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 2026-09-22.	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/24971"><img src="https://ip-fd.net/badge/asn/24971/health.svg" alt="AS24971 network health on IP-FD.net"></a>

Markdown

[![AS24971 network health](https://ip-fd.net/badge/asn/24971/health.svg)](https://ip-fd.net/asn/24971)

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

Routing changes

Last 30 days

2026-10-04 07:16 UTC	Neighbour gone	AS13194	upstream
2026-10-04 07:16 UTC	Relationship changed	AS8218	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS6663	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS6204	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS50629	upstream to peer
2026-10-04 07:16 UTC	New neighbour	AS47232	peer
2026-10-04 07:16 UTC	Relationship changed	AS4455	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS33891	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS264409	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS263444	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS21320	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS197451	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS1764	upstream to peer
2026-10-04 07:16 UTC	Relationship changed	AS14840	upstream to peer

WHOIS

aut-num:        AS24971
as-name:        MASTER-AS
org:            ORG-MIs2-RIPE
remarks:        . . _ _
remarks:        |\/| _. __|_ _ ._| \/
remarks:        | |(_|_> |_(/_| |_/\_
remarks:        
descr:          Czech Republic / www.master.cz
descr:          e-mail: noc@master.cz
remarks:        
remarks:        ======================== Upstream ========================
remarks:        
remarks:        = Arelion FKA Telia
remarks:        
remarks:        
remarks:        = RETN
remarks:        
remarks:        
remarks:        ======================== Downstream ========================
remarks:        
remarks:        = Q-Net CZ
remarks:        = netsafe
remarks:        = INTACTO GAMES a.s.
remarks:        = DCIT, a.s.
remarks:        = amccomp s.r.o.
remarks:        = LAYER6
remarks:        = Dragon-Capital
remarks:        = INIZIO Internet Media s.r.o.
remarks:        
remarks:        ======================== peering.cz peering ========================
remarks:        
remarks:        
remarks:        ======================== NIX Prague peering ========================
remarks:        
remarks:        
remarks:        ======================== NIX Bratislava peering ========================
remarks:        
remarks:        
admin-c:        MAIc-RIPE
admin-c:        MZI-RIPE
tech-c:         MAIc-RIPE
tech-c:         MZI-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MASTER-MNT
created:        2002-06-11T14:14:49Z
last-modified:  2026-09-22T11:58:17Z
source:         RIPE
% 26 routing policy lines (import/export) not shown

Routing data

Updated 9 h ago

Registry record

Fetched 9 h ago 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/24971

const res = await fetch('https://ip-fd.net/api/v1/asn/24971', {
  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/24971', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/24971');
curl_setopt($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/24971", 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.

AS1299	Arelion Sweden AB TWELVE99
AS6939	Hurricane Electric LLC HURRICANE
AS9002	RETN Limited RETN-AS

AS21045	K-net Technical International Group, s.r.o. QnetCZ
AS48921	Yoursafe Holding B.V. VEROTEL-AS
AS51134	Development 777 s.r.o. INTACTO-AS
AS64481	Joint Venture Dragon Capital LLC Dragon-Capital-AS
AS202857	INIZIO Internet Media s.r.o. CZ-AS
AS204957	ROUTE 95 LLC GREENFLOID-AS
AS207167	mapnet IT services s.r.o. amccomp-master-brno
AS211085	mapnet IT services s.r.o. amccomp-master-praha

AS1764	Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH NEXTLAYER-AS
AS3212	Telemach Slovenija d.o.o. TELEMACH
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
AS8529	Zain Omantel International FZ-LLC OMANTEL-AS
AS14840	BR.Digital Telecom AS14840
AS21320	GEANT Vereniging GEANT_IAS_VRF
AS24482	SG.GS SGGS-AS-AP
AS28917	Fiord Networks, UAB Fiord-AS
AS29504	Freenet Liberec, z.s. LBCFREE
AS33891	Core-Backbone GmbH CORE-BACKBONE
AS35369	LINZ STROM GAS WAERME GmbH fuer Energiedienstleistungen und Telekommunikation LINZAG-TELEKOM-AS
AS36236	NetActuate, Inc NETACTUATE
AS37721	Virtual Technologies & Solutions
AS40994	Hohl IT e.U. Alwyzon
AS41327	Fiber Telecom S.p.A. FIBERTELECOM-AS
AS47232	ISP Alliance a.s. ISPAlliance
AS47692	Nessus GmbH NESSUS
AS49544	i3D.net B.V i3Dnet
AS50629	LWLcom GmbH LWLCOM
AS51184	Fonira Telekom GmbH FONIRA
AS59890	Kabel-TV Lampert GmbH & Co KG Kabel-TV-Lampert
AS197451	Brno University of Technology VUTBR-AS
AS198150	SIACOM JSC SIACOM-AS
AS212483	LEVEL EIGHTY-SIX COMMUNICATIONS LTD level86
AS263444	Open X Tecnologia Ltda AS263444
AS264409	Huge Solucoes Corporativas Ltda AS264409