Since the very start of web addresses being introduced, only Latin-script (English) based web addresses would work. With the ever increasing number of web addresses in use, the regulatory body assigning domain name details has approved the use of non-English addresses.
ICANN, the Internet Corporation for Assigned Names and Numbers, have approved a number of internationalised domain names which could be rolled out as soon as next year.
At the moment, only the standard 26 letter English alphabet from A-Z and including 0-9 can be used. This new process will allow in theory any language using any symbol to enter web addresses.