Country Code of Antartica
There are no official codes for Antartica as it is not a sovereign states and it is not governed by any one country.
However the antartic treaty system is a frame work that govance the continent and it sorounding oceans, and curently has 54 signatory nations.
This nations are often represented in antartical by research stations, which are identified by their respective national flags
So, inshort, there are no country code for Antartica, but the research stations there may use the country codes of their respective nations.