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-WEBSUPPORT REG-GRANSY REG-MOJEID REG-WEBSUPPORT REG-WEBSUPPORT REG-WEBSUPPORT
Tomas Jakubcin - WEBolution SpeedWeb s. r. o. Websupport, s.r.o.
Make a direct request at ICANN.