AS24971 — MASTER-AS Czech Republic www.master.cz

Network type: hosting

AS24971 announces 31 IPv4 prefixes covering 58,112 addresses and 25 IPv6 prefixes.

About this network

The AS handle MASTER-AS is operated by MasterDC s.r.o., a Czech data center and hosting provider.

What it's used for

• The address space carries data center and virtualization infrastructure, evidenced by reverse DNS entries such as static.masterinter.net, network.master-c2.virtualmaster.cz, and internal rack identifiers like vl25.sl527s.r1-8.dc1.4d.prg.masterinter.net.
• The AS announces 58,112 IPv4 addresses across 31 prefixes and 26 IPv6 prefixes, while maintaining 41 observed routing neighbours. This ratio of substantial address inventory to a moderate number of peers indicates a hosting and business access network rather than a transit provider.

Notable

• Registrants for the majority of the largest prefixes, including 77.93.192.0/19 and 83.167.224.0/19, are listed as MasterDC s.r.o., aligning with the AS holder. However, some blocks are registered to third parties, such as vpsFree.cz, z.s. for 37.205.8.0/21 and W HOSTING, s.r.o. for 91.226.216.0/22, suggesting leased space or customer allocations.
• The inventory consists of a mix of large /19 and /20 blocks alongside numerous smaller /22 and /24 prefixes, reflecting a segmented corporate estate with distinct subnets for different services or customer groups.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 5.180.200.0/22
• 37.140.220.0/24
• 37.205.8.0/21
• 77.93.192.0/19
• 80.79.16.0/20
• 81.31.32.0/20
• 83.167.224.0/19
• 83.223.52.0/24
• 85.118.128.0/21
• 89.185.224.0/19
• 91.213.160.0/24
• 91.214.192.0/22
• 91.216.179.0/24
• 91.226.216.0/22
• 92.63.56.0/24
• 130.193.16.0/24
• 149.62.144.0/21
• 176.227.168.0/23
• 178.238.32.0/20
• 185.8.164.0/22
• 185.25.184.0/22
• 185.32.160.0/24
• 185.58.40.0/22
• 185.85.164.0/22
• 185.145.160.0/22
• 185.239.216.0/22
• 188.213.234.0/23
• 188.215.18.0/23
• 193.169.160.0/23
• 194.145.180.0/22
• 195.140.252.0/22
• 2001:678:a50::/48
• 2001:67c:68::/48
• 2a00:8220::/32
• 2a00:a5a0::/32
• 2a01:430::/43
• 2a01:430:12::/47
• 2a01:430:14::/46
• 2a01:430:18::/45
• 2a01:430:20::/43
• 2a01:430:40::/42
• 2a01:430:80::/41
• 2a01:430:100::/40
• 2a01:430:200::/39
• 2a01:430:400::/38
• 2a01:430:800::/37
• 2a01:430:1000::/36
• 2a01:430:2000::/35
• 2a01:430:4000::/34
• 2a01:430:8000::/33
• 2a03:3b40::/38
• 2a03:7460::/32
• 2a04:16c0:200::/48
• 2a07:4880::/29
• 2a0b:3240::/32
• 2a0c:6380::/29

Upstream networks

• AS1299 Arelion Sweden AB
• AS9002 RETN Limited
• AS6939 Hurricane Electric LLC
• AS37721 Virtual Technologies & Solutions
• AS29504 Freenet Liberec, z.s.
• AS24482 SG.GS
• AS57463 NetIX Communications JSC
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH
• AS33891 Core-Backbone GmbH
• AS8218 Zayo Infrastructure France SA

Downstream networks

• AS204957 ROUTE 95 LLC
• AS207167 mapnet IT services s.r.o.
• AS51134 Development 777 s.r.o.
• AS211085 mapnet IT services s.r.o.
• AS21045 K-net Technical International Group, s.r.o.
• AS202857 INIZIO Internet Media s.r.o.
• AS64481 Joint Venture Dragon Capital LLC
• AS48921 Yoursafe Holding B.V.

Adjacent networks

• AS9002 RETN Limited
• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS204957 ROUTE 95 LLC
• AS207167 mapnet IT services s.r.o.
• AS48921 Yoursafe Holding B.V.
• AS51134 Development 777 s.r.o.
• AS211085 mapnet IT services s.r.o.
• AS29504 Freenet Liberec, z.s.
• AS24482 SG.GS
• AS37721 Virtual Technologies & Solutions
• AS57463 NetIX Communications JSC
• AS64481 Joint Venture Dragon Capital LLC
• AS202857 INIZIO Internet Media s.r.o.
• AS21045 K-net Technical International Group, s.r.o.
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH
• AS33891 Core-Backbone GmbH
• AS8218 Zayo Infrastructure France SA
• AS47232 ISP Alliance a.s.

Internet exchanges

• Peering.cz — Prague, Czech Republic
• NIX.CZ - Neutral Internet eXchange for the Czech Republic — Prague, Czech Republic