AD — Andorra

Andorra is a tiny principality nestled in the Pyrenees mountains between France and Spain. Andorra la Vella, the capital, is the highest capital city in Europe at 1,023 meters. Despite its small size, Andorra attracts millions of visitors annually for duty-free shopping and skiing. Andorra uses the Euro despite not being an EU member, through a monetary agreement. For developers, the AD country code maps to the ca-AD locale for Catalan, the official language. The .ad domain serves Andorran websites, and +376 is the dialing code. Andorra's co-principality governance (headed by both the French President and the Bishop of Urgell) is unique worldwide. Andorra's use of the Euro without EU membership is an important case for applications — it should be included in Eurozone country lists for currency purposes but not in EU member state lists for regulatory purposes. The .ad domain has been used for advertising-related domain hacking.