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-ZONER REG-CZNIC REG-INTERNET-CZ REG-ZONER REG-MOJEID REG-ZONER REG-INTERNET-CZ
eSports.cz, s.r.o. SPIDER.CZ, s.r.o. ZONER a.s.
Make a direct request at ICANN.