Problem:
We want to search List1 (column A) for the value stored in cell B2 and retrieve the row numbers that correspond with every successful match.
Solution:
Use the SMALL, IF, and ROW functions as shown in the following Array formula:
{=SMALL(IF($A$2:$A$8=$B$2,ROW($A$2:$A$8),99999),ROW()-ROW($B$2)+1)}
Copy the formula down column C until 99999 is returned, which indicates that no further matches were found.
To apply Array formula:
Select the cell, press and simultaneously press .
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