Why does South Africa have the top level domain name of .za and not .sa?
The country codes were established by the International Standards Organization (ISO) before the domain name system. Internet governance adheres to all international standards.
Is it possible to obtain the whois (ownership and availability information) for a .ZA domain name?
Yes, depending on the second level that you are considering.
I would like to register a domain under the .ZA top level, how do I do this?
At present one may only register a domain on the third level (e.g.. name.sld.za).