.oz

.oz is a top-level pseudo- domain used in the senders of email messages from the Australian computer science network MHSnet in the 1980s and 1990s.

In those days, the Internet was just one of the distributed computer networks. Computers that are not connected to the Internet, but connected to another computer network ( BITNET , CSNET , MHSnet or UUCP ), could exchange messages through gateways . To go through the gateway gateway, messages from these networks were designated by domain suffixes such as .bitnet, .csnet, .oz, and .uucp, but there were no corresponding domains in the Internet domain name system .

The addresses of computers connected to the MHSnet network were considered to be in the pseudo-domain .oz. Messages from them were sent to the Internet with the suffix .oz.au.