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The output for %p conversion in the  fprintf function (4.9.6.1).

Two types of pointers are supported:  near pointers (%hp), and far pointers
(%lp).  The output for %p depends on the memory model being used.

In 16-bit mode, the  fprintf function produces hexadecimal values of the
form XXXX for 16-bit near pointers, and XXXX:XXXX (segment and offset
separated by a colon) for 32-bit far pointers.

In 32-bit mode, the  fprintf function produces hexadecimal values of the
form XXXXXXXX for 32-bit near pointers, and XXXX:XXXXXXXX (segment and
offset separated by a colon) for 48-bit far pointers.