We have investigated the electric properties of ionically conducting ZrO2-Y2O3 ceramics and single crystals with molar concentrations ranging from 4 mol% Y2O3 to 12 mol% Y2O3. The frequency dependent conductivities and dielectric constants were measured in the frequency range from 20 Hz to 1 GHz and at temperatures 300 K less than or equal to T less than or equal to 1100 K. The spectra are analyzed carefully in order to separate the bulk conductivity from blocking electrode and grain boundary effects. The intrinsic conductivity follows the universal dielectric response expression : sigma'(w)=sigma(dc) + Aw(s). In contrast, the corresponding formula for the dielectric permittivity, epsilon'(w)=epsilon(x) + Aw(s-1) tan(s pi/2)/epsilon(0) cannot explain the step-like frequency dependence of the experimental data. The observed feature is attributed to the hopping of the mobile ions.