WHOIS client version 5.2.19 is available for download (2017/12/11):
RPM: "yum install whois"
"whois (5.2.19) unstable;
urgency=medium
* Switched do libidn2.
* Adopted getentropy(2) for mkpasswd on recent Linux.
* Updated the .id and .museum TLD servers.
* Removed the .dj TLD server.
-- Marco d'Itri <
"This application is a command line WHOIS client utility for checking domains and IP address's in various whois databases on the internet."
Source: eCSoft/2