IDN technical limitations


.eu IDNs are subject to the same technical limitations as other .eu domain names. Additional technical limitations apply as well:

  • You are not allowed to mix scripts, or character sets (for example, Latin, Greek and Cyrillic), in a single IDN. This means each IDN must use characters from a single (1) script only.
  • An IDN may not be longer than 63 characters after it is converted into the ACE string format needed by the Domain Name System.
  • An IDN may not start with the characters xn--.
  • Not all characters are supported by IDNs. The German ß is not allowed, for example. See our