| 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. |


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

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

| 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
| - | 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 |
IPv4: 100
IPv6: 70
| Name | IPv4 | IPv6 | Link Speed | |
|---|---|---|---|---|
![]() ![]() |
NIX.CZ | 91.210.16.86 | 2001:7f8:14::11:2 | 200 gbps |
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Peering.cz | 185.0.20.14 | 2001:7f8:7f::14 | 100 gbps |
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NIX.CZ FENIX | 194.50.100.86 | 2001:7f8:14:5ec::11:2 | 100 gbps |
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NIX.CZ FENIX | 194.50.100.85 | 2001:7f8:14:5ec::11:1 | 100 gbps |
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BR-IX | 185.1.25.11 | 2001:7f8:87::11 | 10 gbps |
![]() ![]() |
NIX.SK | 194.30.187.85 | 2001:7f8:91::8:1 | 10 gbps |
![]() ![]() |
NIX.CZ | 91.210.16.85 | 2001:7f8:14::11:1 | n/a |