Register * You must register for access to some support pages  FAQ Search   Support Main Menu  Entry #358: What mode is my AIX system booted in (32-bit or 64-bit)? Question What mode is my AIX system booted in (32-bit or 64-bit)? Answer To find out what mode an AIX system is booted in, 32-bit or 64-bit, issue the following command from the root account: bootinfo -K This will return a string with either 32 or 64.