Autonomous System

AS24971 MasterDC s.r.o.

HostingActiveCzechiaRIPE

AS24971 (MASTER-AS) is a hosting network operated by MasterDC s.r.o. in Czechia, registered with RIPE. It has 33 IPv4 prefixes with 58,880 addresses and 13 IPv6 prefixes, which makes it the 4,049th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses58,880in 33 prefixes
IPv6 prefixes13≈ 1.7 × 10³⁰ addresses
Size rank#4,049of 82,200 active ASNs
Abuser scoreLow0.33% of its addresses flagged · method

Details

OrganizationMasterDC s.r.o. · hosting provider profile
AS nameMASTER-AS
Websitemaster.cz
Country Czechia (CZ)
Network typeHosting
RegistryRIPE
Abuse contactabuse@master.cz
Registered2002-06-11
Last updated2026-09-22

IPv4 prefixes

33 prefixes · 58,880 addresses
NetworkAddressesFirst – last address
77.93.192.0/198,19277.93.192.0 – 77.93.223.255
83.167.224.0/198,19283.167.224.0 – 83.167.255.255
89.185.224.0/198,19289.185.224.0 – 89.185.255.255
80.79.16.0/204,09680.79.16.0 – 80.79.31.255
81.31.32.0/204,09681.31.32.0 – 81.31.47.255
178.238.32.0/204,096178.238.32.0 – 178.238.47.255
85.118.128.0/212,04885.118.128.0 – 85.118.135.255
149.62.144.0/212,048149.62.144.0 – 149.62.151.255
5.180.200.0/221,0245.180.200.0 – 5.180.203.255
37.205.8.0/221,02437.205.8.0 – 37.205.11.255
37.205.12.0/221,02437.205.12.0 – 37.205.15.255
91.214.192.0/221,02491.214.192.0 – 91.214.195.255
91.226.216.0/221,02491.226.216.0 – 91.226.219.255
185.25.184.0/221,024185.25.184.0 – 185.25.187.255
185.32.160.0/221,024185.32.160.0 – 185.32.163.255
185.58.40.0/221,024185.58.40.0 – 185.58.43.255
185.85.164.0/221,024185.85.164.0 – 185.85.167.255
185.145.160.0/221,024185.145.160.0 – 185.145.163.255
185.239.216.0/221,024185.239.216.0 – 185.239.219.255
194.145.180.0/221,024194.145.180.0 – 194.145.183.255
195.140.252.0/221,024195.140.252.0 – 195.140.255.255
176.227.168.0/23512176.227.168.0 – 176.227.169.255
185.8.164.0/23512185.8.164.0 – 185.8.165.255
185.8.166.0/23512185.8.166.0 – 185.8.167.255
188.213.234.0/23512188.213.234.0 – 188.213.235.255
The 25 largest of 33. The API and the database have all of them.

IPv6 prefixes

13 prefixes
  • 2a07:4880::/29
  • 2a0c:6380::/29
  • 2a00:8220::/32
  • 2a00:a5a0::/32
  • 2a01:430::/32
  • 2a03:7460::/32
  • 2a0b:3240::/32
  • 2a03:3b40:200::/39
  • 2a03:3b40::/40
  • 2a03:3b40:100::/40
  • 2001:678:a50::/48
  • 2001:67c:68::/48
  • 2a04:16c0:200::/48

Query AS24971 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS24971&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS24971, with or without a key:

curl "https://api.ipapi.is/?q=77.93.192.1"

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