It is possible to register the letters a to z, the numbers 0 to 9 and the hyphen “-“.
In addition, the following characters are allowed: áàăâåäãąāæćĉčċçďđéèĕêěëėęēğĝġģĥħíìĭîïĩįīıĵķĺľļłńňñņŋóòŏôöőõøōœĸŕřŗśŝšşßťţŧúùŭûůüűũųūŵýŷÿźžżðþ
It is not possible to register domains that begin or end with a hyphen “-“ or have a hyphen in the third and fourth position.