Based on first-principles calculations, we have systematically investigated the structural stability, electronic and magnetic properties of zigzag C2N nanoribbons (ZC(2)NNRs). Different from zigzag graphene nanoribbons (ZGNRs), the ground states of ZC(2)NNRs present ferromagnetic metal, antiferromagnetic semiconductor and spin semiconductor dependently on the edge configuration and width of nanoribbons. Our results suggest the ZC(2)NNRs have great potential applications in spintronic, thermoelectric and optoelectronic devices. (C) 2017 Published by Elsevier B.V.