In this work, we report the structural, electrical and Mössbauer spectroscopic studies of Ni_0.5Cu_0.25Zn_0.25Fe_2-xIn_xO₄; x = 0. 0.1, 0.2, 0.3, 0.4 spinel ferrites, synthesized by using citrate-nitrate precursor auto combustion method. In order to  investigate the formation of the spinel phase, thermal analysis (DTA-TGA) was performed. The phase recognition, crystallinity and morphology of as prepared samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The crystal structure was found to be cubic spinel and the lattice constants increased linearly with increasing quantity of In3+ ions. Room temperature Mössbauer spectrum of x = 0 sample shows four sextets due to Fe3+ ions at octahedral and tetrahedral sites. The ac conductivity was studied as a function of frequency which revealed that the hopping of electrons between Fe³⁺ ↔ Fe²⁺ as well as the hole hopping between Ni³⁺ ↔ Ni²⁺ are responsible for conduction mechanism in the studied compound.