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	Prefix	Description
	5.180.200.0/22	Bydzovsky s.r.o.
	37.140.220.0/24	ProfiSMS s.r.o.
	37.205.8.0/22	vpsFree.cz, z.s.
	37.205.12.0/22	-
	77.93.192.0/19	MasterDC s.r.o.
	80.79.16.0/20	MasterDC s.r.o.
	81.31.32.0/20	MasterDC s.r.o.
	83.167.224.0/19	MasterDC s.r.o.
	83.223.52.0/24	-
	85.118.128.0/21	MasterDC s.r.o.
	89.185.224.0/19	MasterDC s.r.o.
	91.213.160.0/24	Internet Info, s.r.o.
	91.214.192.0/22	QCM, s.r.o.
	91.216.179.0/24	oXyShop s.r.o.
	91.226.216.0/22	W HOSTING, s.r.o.
	92.63.56.0/24	NEW TELEKOM, spol. s r.o.
	130.193.16.0/24	AUTO GAMES PLUS a.s.
	149.62.144.0/21	MasterDC s.r.o.
	176.227.168.0/23	HostingSolutions s.r.o.
	178.238.32.0/20	MasterDC s.r.o.
	185.8.164.0/23	vpsFree.cz, z.s.
	185.8.166.0/23	vpsFree.cz, z.s.
	185.25.184.0/22	NETIO Solutions s.r.o.
	185.32.160.0/22	ANAFRA a.s.
	185.58.40.0/22	MasterDC s.r.o.
	185.85.164.0/22	ServerNow s.r.o.
	185.145.160.0/22	Etnetera Core a.s.
	185.239.216.0/22	AdminIT, s. r. o.
	188.213.234.0/23	NETIO Solutions s.r.o.
	188.215.18.0/23	NETIO Solutions s.r.o.
	193.169.160.0/23	Imarto Inc.
	194.145.180.0/22	ServerNow s.r.o.
	195.140.252.0/22	Virtualmaster, s.r.o.
	2001:678:a50::/48	Imarto Inc.
	2001:67c:68::/48	Internet Info, s.r.o.
	2a00:8220::/32	NETIO Solutions s.r.o.
	2a00:a5a0::/32	ANAFRA a.s.
	2a01:430::/32	MasterDC s.r.o.
	2a03:3b40::/40	vpsFree.cz - IPv6 - Prague 2
	2a03:3b40:100::/40	vpsFree.cz - IPv6 - Brno 2
	2a03:3b40:200::/39	vpsFree.cz, z.s.
	2a03:7460::/32	ServerNow s.r.o.
	2a04:16c0:200::/48	-
	2a07:4880::/29	Etnetera Core a.s.
	2a0b:3240::/32	Bydzovsky s.r.o.
	2a0c:6380::/29	AdminIT, s. r. o.

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS1299	Arelion (fka. Telia Carrier)	✔	✔
	AS9002	RETN Limited	✔	✔
	AS197451	Brno University of Technology	✘	✔

---

Peers

	ASN	Description	IPv4	IPv6
	AS1299	Arelion (fka. Telia Carrier)	✔	✔
	AS9002	RETN Limited	✔	✔
	AS6939	Hurricane Electric LLC	✔	✔
	AS207167	mapnet IT services s.r.o.	✔	✔
	AS204957	GREEN FLOID LLC	✔	✔
	AS51134	Development 777 s.r.o.	✔	✔
	AS48921	Yoursafe Holding B.V.	✔	✔
	AS211085	mapnet IT services s.r.o.	✔	✔
	AS5405	Inter.link GmbH	✔	✔
	AS21045	K-net Technical International Group, s.r.o.	✔	✘
	AS64481	Joint Venture Dragon Capital LLC	✔	✘
	AS6204	INTERKVM HOST SRL	✔	✔
	AS50629	LWLcom GmbH	✔	✔
	AS24940	Hetzner Online GmbH	✔	✔
	AS8218	Zayo Europe	✔	✔
	AS20562	Open Peering (Broadband Hosting B.V.)	✔	✔
	AS9136	WOBCOM GmbH	✔	✔
	AS33891	Core-Backbone GmbH	✔	✔
	AS14840	BR.DIGITAL	✔	✔
	AS49544	i3D.net B.V	✔	✔
	AS216265	ARISTO NETWORKS LTD	✔	✘
	AS200249	Products Up GmbH	✔	✔
	AS60068	Datacamp Limited (CDN77 / DataPacket)	✔	✔
	AS8529	Zain Omantel International FZ-LLC	✔	✔
	AS50698	TETA s.r.o.	✔	✔
	AS32590	Valve Corporation	✔	✔
	AS51184	Fonira Telekom GmbH	✔	✔
	AS1764	Next Layer Telecommunications	✔	✔
	AS40994	Alwyzon (Hohl IT)	✔	✔
	AS57304	RETN Russia	✔	✔
	AS49121	Infinity Telecom, s.r.o.	✔	✔
	AS34170	Aztelekom LLC	✔	✔
	AS199524	Gcore S.A.	✔	✔
	AS8881	1&1 Versatel GmbH	✔	✔
	AS4455	IX Reach Ltd	✔	✘
	AS8801	Rocket Fibre Ltd	✔	✔
	AS60345	icixs networks GmbH	✔	✘
	AS57344	Telehouse EAD	✔	✘
	AS53062	ALT | GRUPO BRASIL TECPAR	✔	✘
	AS21430	WIA spol. s.r.o.	✔	✘
	AS2852	CESNET z.s.p.o.	✔	✘
	AS44066	firstcolo GmbH	✔	✔
	AS215120	Evolus IT Solutions GmbH	✔	✔
	AS56382	vServer.site LTD	✔	✔
	AS8767	M-net Telekommunikations GmbH	✔	✔
	AS34779	T-2, d.o.o.	✔	✔
	AS24482	SG.GS	✔	✔
	AS42473	Anexia Cloud Solutions GmbH	✔	✔
	AS36236	NetActuate, Inc	✔	✔
	AS1820	WNET TELECOM USA Corp.	✔	✔
	AS16097	HL komm Telekommunikations GmbH	✔	✘
	AS264409	Huge Networks	✔	✘
	AS21013	eww ag	✔	✘
	AS6663	Türk Telekom International	✔	✔
	AS35297	Dataline LLC	✔	✔
	AS30058	FDCservers.net	✔	✘
	AS21320	GEANT Vereniging	✔	✘
	AS47927	WIFIWEB s.r.l.	✘	✔
	AS3212	Telemach Slovenija d.o.o.	✔	✘
	AS9009	M247 Europe SRL	✔	✘
	AS29049	Delta Telecom Ltd	✔	✘
	AS22356	Durand do Brasil Ltda	✔	✘
	AS24953	NETPLANET GmbH	✔	✘
	AS197451	Brno University of Technology	✘	✔
	AS263444	Open X Tecnologia Ltda	✘	✔
	AS37721	Virtual Technologies & Solutions	✘	✔

---

Downstreams

	ASN	Description	IPv4	IPv6
	AS207167	mapnet IT services s.r.o.	✔	✔
	AS204957	GREEN FLOID LLC	✔	✔
	AS51134	Development 777 s.r.o.	✔	✔
	AS211085	mapnet IT services s.r.o.	✔	✔
	AS48921	Yoursafe Holding B.V.	✔	✔
	AS64481	Joint Venture Dragon Capital LLC	✔	✘
	AS21045	K-net Technical International Group, s.r.o.	✔	✘

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:
import:         from AS1299 action pref=90; accept ANY AND NOT {0.0.0.0/0};
export:         to AS1299  announce  AS24971:AS-MASTERCZ
remarks:
remarks:        = RETN
remarks:
import:         from AS9002 action pref=90; accept ANY AND NOT {0.0.0.0/0};
export:         to AS9002  announce  AS24971:AS-MASTERCZ
remarks:
remarks:        ========================  Downstream ========================
remarks:
remarks:        = Q-Net CZ
import:         from AS21045 action pref=10; accept AS21045
export:         to AS21045 announce ANY
remarks:        = netsafe
import:         from AS48921 action pref=10; accept AS48921 AS-FDR
export:         to AS48921 announce ANY
remarks:        = INTACTO GAMES a.s.
import:         from AS51134 action pref=10; accept AS51134
export:         to  AS51134 announce ANY
remarks:        = DCIT, a.s.
import:         from AS199806  action pref=10; accept AS199806
export:         to  AS199806 announce ANY
remarks:        = amccomp s.r.o.
import:         from AS207167 action pref=10; accept AS207167 AS201922 AS208143 AS215777 AS206321 AS207583 AS207575 AS207576
export:         to AS207167 announce {0.0.0.0/0};
remarks:        = LAYER6
import:         from AS204957 action pref=10; accept AS204957;
export:         to AS204957 announce {0.0.0.0/0};
remarks:        = Dragon-Capital
import:         from AS64481 action pref=10; accept AS64481;
export:         to AS64481 announce {0.0.0.0/0};
remarks:
remarks:        ========================  peering.cz peering ========================
remarks:
import:         from AS24971:AS-MAI-PEERING-CZ-PEER action pref = 50; accept as-peeringcz-rs
export:         to   AS24971:AS-MAI-PEERING-CZ-PEER announce AS24971:AS-MASTERCZ-CZPEERING
remarks:
remarks:        ========================  NIX Prague peering ========================
remarks:
import:         from AS24971:AS-MAI-NIX-PEER action pref = 50; accept AS47200:AS-NIXCZ-RSCLIENTS
export:         to   AS24971:AS-MAI-NIX-PEER announce AS24971:AS-MASTERCZ-CZNIX
remarks:
remarks:        ========================  NIX Bratislava peering ========================
remarks:
import:         from AS24971:AS-MAI-NIX-PEER action pref = 50; accept AS47627:AS-NIXSK-RSCLIENTS
export:         to   AS24971:AS-MAI-NIX-PEER announce AS24971:AS-MASTERCZ-SKNIX
remarks:
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MASTER-MNT
created:        2002-06-11T14:14:49Z
last-modified:  2025-10-26T06:21:55Z
source:         RIPE
remarks:        ****************************
remarks:        * THIS OBJECT IS MODIFIED
remarks:        * Please note that all data that is generally regarded as personal
remarks:        * data has been removed from this object.
remarks:        * To view the original object, please query the RIPE Database at:
remarks:        * http://www.ripe.net/whois
remarks:        ****************************


organisation:   ORG-MIs2-RIPE
org-name:       MasterDC s.r.o.
country:        CZ
org-type:       LIR
address:        Dummy address for ORG-MIs2-RIPE
# Email removed, Log into bgp.tools to see whois emails
mnt-ref:        MASTER-MNT
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MASTER-MNT
abuse-c:        MAIc-RIPE
created:        2004-04-17T11:04:37Z
last-modified:  2025-04-29T09:47:49Z
source:         RIPE
remarks:        ****************************
remarks:        * THIS OBJECT IS MODIFIED
remarks:        * Please note that all data that is generally regarded as personal
remarks:        * data has been removed from this object.
remarks:        * To view the original object, please query the RIPE Database at:
remarks:        * http://www.ripe.net/whois
remarks:        ****************************

Last Update: 2026-03-11T03:23:52Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RIPE	as-retn-actual-v6	3924
RIPE	as8251:as-nix-peerings	49
RIPE	as24971:as-mastercz	22
RIPE	as-sixsk-members	57
RIPE	as-emaxsixpeers	39
RIPE	as-43413_nt-nix	69
RIPE	as-sixstip-set	47
RADB	as174:as-cogc-033	45
LEVEL3	as-level3-customers-eu	0
RIPE	as24971:as-mai-peering-cz-peer	10
RIPE	as42000:as-nixcz-peerings	80
RIPE	as-retn-actual-v4	12735
RIPE	as5578:as-sixpeers	51
RIPE	as-transcz	796
RIPE	as-energotel_six_peers	52
ALTDB	as51202:as-all	5307
RIPE	as-to2-nix-peer	63