Actually at the moment both Agni IV and V aren't MIRV capable - For a missile to be MIRV capable it should feature a post boost control vehicle (PBV) on top of its respective stages. Both Agni IV and V lack PBV and neither has it been tested on any Indian missile - Probably Agni VI will be India's first MIRV capable ICBM featuring a post boost control vehicle (PBV) on top of its three stages. It is to be tested by 2017.
Advanced Agni-6 missile with multiple warheads likely by 2017 | Business Standard News
@MilSpec @Abingdonboy Has India tested any missile with Multiple warhead / MRV? (MRV – Multiple Reentry Vehicles) which deliver two or more warheads against the same target contrary to the MIRV's which hit separate targets.
