The records are in Ancestry.com. See the last entry.

Ancestry.com. Civil War Prisoner of War Records, 1861-1865 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2007.

Original data: Selected Records of the War Department Commissary General of Prisoners Relating to Federal Prisoners of War Confined at Andersonville, GA, 1864-65; (National Archives Microfilm Publication M1303, 6 rolls); Records of the Commissary General of Prisoners, Record Group 249; National Archives, Washington, D.C.

Selected Records of the War Department Relating to Confederate Prisoners of War, 1861-1865; (National Archives Microfilm Publication M598, 145 rolls); War Department Collection of Confederate Records, Record Group 109; National Archives, Washington, D.C.
Lists of Confederates Captured at Vicksburg, Mississippi, July 4, 1863; (National Archives Microfilm Publication M2072, 1 roll); War Department Collection of Confederate Records, Record Group 109; National Archives, Washington, D.C.

Register of Confederate Soldiers, Sailors, and Citizens who Died in Federal Prisons and Military Hospitals in the North, 1861-1865; (National Archives Microfilm Publication M918, 1 roll); Records of the Office of the Quartermaster General, Record Group 92; National Archives, Washington, D.C.