x86_64 Register Posted on 2018-05-24 Edited on 2025-02-10 In CTF Views: Register Register Name 16bit 32bit 64bit Accumulator AX EAX RAX Base BX EBX RBX Counter CX ECX RCX Data DX EDX RDX Instruction Pointer IP EIP RIP Source Pointer SP ESP RSP Base Pointer BP EBP RBP Source Index SI ESI RSI