From ARVic, original post here.

The International Telecommunications Union, or ITU, is an international organisation established to standardise radio and telecommunications.  The ITU was founded as the International Telegraph Union in Paris on May 17, 1865 and is the world’s oldest international organisation.  May 17, is celebrated annually as World Telecommunication Day.

The Wireless Institute of Australia has a long standing agreement with the regulator, the Australian Communications and Media Authority, that the alternative AX prefix is available for the period 0001-2359 hours local time on May 17 to mark World Telecommunication Day.

The WIA recommends that those who use the AX prefix do so with an appropriate QSL card, especially to meet the needs of award and prefix hunters.