De or het mapping?

The correct Dutch article is:

de mapping

Rule Words ending in -ing: almost always de. See the rule

This word is not in the word lists we use to double-check answers.

How to use mapping

the mappingde mapping
this mappingdeze mapping
that mappingdie mapping
our mappingonze mapping
your mappingjouw mapping
every mappingelke mapping
which mapping?welke mapping?
a big mapping / the big mappingeen grote mapping, de grote mapping