DF-21D is an anti-ship ballistic missile that has a maximum range exceeding 1,450 kilometres (900 mi; 780 nmi), according to the U.S. National Air and Space Intelligence Center. The Intelligence Center did not believe it was deployed in 2009. The guidance system is thought to be still in an evolutionary process as more UAVs and satellites are added.
The US Department of Defense stated in 2010 that China has developed and reached initial operating capability (IOC) of a conventionally armed high hypersonic land-based anti-ship ballistic missile based on the DF-21. This is the first ASBM and weapon system capable of targeting a moving aircraft carrier strike group from long-range, land-based mobile launchers. The DF-21D is thought to employ maneuverable reentry vehicles (MaRVs) with a terminal guidance system. It may have been tested in 2005-6, and the launch of the Jianbing-5/YaoGan-1 and Jianbing-6/YaoGan-2 satellites offering targeting information from synthetic aperture radar (SAR) and visual imaging respectively. The upgrades enhance China’s ability to prevent US carriers from operating in the Taiwan Strait. Some have also suggested China could develop a “MIRVd” DF-21D with multiple independent missiles. (wikipedia)