mask question

[philsmd]

Hi,

please read http://hashcat.net/wiki/doku.php?id=mask_attack and --help.

What you should investigate is what custom charsets do (--custom-charset1, --custom-charset2, --custom-charset3, --custom-charset4 or short form -1, -2, -3, -4).

This should work:
-1 23 ?1?d?d