One formula way for multi-column blank cells address.
1] In K2, array formula (CSE formula) copy down :
=IFERROR(ADDRESS(MID(SMALL(IF($B$2:$I$20=0,ROW($2:$20)/1%+{2,3,4,5,6,7,8,9}*10001),ROW(B1)),2,2),RIGHT(SMALL(IF($B$2:$I$20=0,ROW($2:$20)/1%+{2,3,4,5,6,7,8,9}*10001),ROW(B1)),2)),"")
2] Please refer to attachment
Regards
Bosco