Register * You must register for access to some support pages  FAQ Search   Support Main Menu  Entry #357: What mode is my Sun system booted in (32-bit or 64-bit)? Question What mode is my Sun system booted in (32-bit or 64-bit)? Answer To find out what mode a Sun Solaris system is booted in, 32-bit or 64-bit: isainfo -b This will return a string with either 32 or 64. This command is only available from Solaris 7 onwards. Solaris operating systems below Solaris 7 are 32-bit.