RDAP source
https://rdap.nic.cz
port 43: whois.nic.cz
The registry blocks changes to the domain.
The registry blocks transfers. Often set for valuable or disputed domains.
Signed delegation in place.
WHOIS source
whois.nic.cz
REG-ACTIVE24 REG-WEBGLOBE REG-WEBGLOBE
ACTIVE 24 ACTIVE 24, s.r.o.
Make a direct request at ICANN.