What is an appropriate format for a .ES domain name?
The only characters allowed for use in a domain name are:
* Those belonging to the Spanish alphabet: from a to z.
* Digits from 0 to 9.
* The hyphen/dash (Cannot be either the first or the last character in the name).
* Domain names are not case-sensitive.
**The maximum and minimum length of the domain name are:
* Second-level domains: the maximum is 63 and the minimum is 3.
* Third-level domains: the maximum is 63 and the minimum is 2.
