TZO Dynamic DNS Lite - Version 1.67 This is the classic version of the TZO Client software which first introduced the idea of linking a domain name to a Dynamic IP address. TZO uses true dynamic DNS client/server technology and has one of the most reliable infrastructures. This allows Internet users with Cable, DSL, and dialup Internet connections to host their own web server, FTP server, mail server, game servers, or any other TCP/IP service from a PC at your home or office.