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We investigate the structural, electronic, and magnetic properties of (M = Fe, Mn)-based zinc blende diluted magnetic semiconductors (DMS) (Al, Ga, In)MN for ( x=0.0625,0.125,0.25), using first-principles calculations with the full-potential linearized augmented plane waves (FP-LAPW) method within the density functional theory and local spin-density approximation. The analysis of electronic structures and magnetic properties show that (Al, Ga, In)FeN at ( x=0.0625,0.125,0.25) are magnetic insulators, and InMnN at ( x=0.0625,0.125) are metallic in nature. On the other hand the (Al, Ga)MnN at ( x=0.0625,0.125,0.25) and InMnN are half-metallic ferromagnets with magnetic spin polarization of 100 %, where the ferromagnetic ground states result from a double-exchange mechanism, and these compounds are predicted to be good candidates for spintronic applications. [ABSTRACT FROM AUTHOR]