You can form a list of Whois servers in Parallels Business Automation - Standard and after this bind each of top level domains to one of more Whois servers.
Note: It is possible to set up the whois with HTTP protocol enabled.
To add a whois server, select Service Director - Domain Manager - Setup - Whois Servers.
To assign a whois server to a TLD, go to the Service Director - Domain Manager - Setup and then select the TLDs tab. Select the TLD and assign one or more whois servers (from the set formed before in Parallels Business Automation - Standard) to a given TLD.