From the WIA, original post here.

Date : 22 / 04 / 2016 
Author : Jim Linton – VK3PC

All VK radio amateurs may use the alternative AX callsign prefix for ANZAC Day.  The WIA reminds those who sign AX to have a QSL card available as these can be sought after as proof of working an AX station.

The WIA thanks all who used the AX prefix last year and registered on its website.  The registration for the centenary of ANZAC was only for 2015, and no online registration is sought this year.

Among the activities will be AX4XQA from the Atherton Tablelands in Far North Queensland.  The Tablelands Radio and Electronics Club hold the XQA suffix in recognition that it was the callsign of the first Amateur Radio station in Queensland, issued in 1914.  The XQA station was closed down by the Australian Government upon the outbreak of World War 1 along with all other amateur radio stations in the country.  There are many war related sites of significance in the Atherton Tablelands region.  AX4XQA will be operated by Dale VK4DMC, a Vietnam veteran, starting around 0400z.  Primary Frequency 7.088 MHz. AM and SSB.

QSL cards will be available upon the receipt of a card and a reply paid envelope.