Any domain name that fulfils the following requirements:
- minimum of 2 characters among the letters "A-Z" and IDN signs with no difference between capital and lower case letters, numbers from "0-9" and the hyphen "-"
- first or last character can not be a hyphen
- hyphen can not be positioned on the 3rd and 4th position simultaneously
- domain name can include from a minimum of 2 to a maximum of 63 characters
- domain name must not be identical to a previously registered .si domain name (that is still in domain name database)
- domain names 113.si and 112.si are reserved for the needs of the Police (113) or the Administration for Civil Protection and Disaster Relief (112), rs.si and si.si for the needs of Slovenian Government.