RDAP source
https://rdap.nic.cz
port 43: whois.nic.cz
The domain is active in the registry.
Signed delegation in place.
WHOIS source
whois.nic.cz
REG-GRANSY REG-WEBGLOBE REG-WEBGLOBE REG-GRANSY REG-CZNIC REG-CZNIC REG-INTERNET-CZ REG-WEBGLOBE
VSHosting s.r.o. CZ.NIC, z.s.p.o. VSHosting s.r.o.
Make a direct request at ICANN.