If you look at a piano, you can see a pattern of octaves. D2 refers to the D note on the second octave of the piano (11 white keys from the leftmost). C7 refers to the C note on the 7th octave (8 white keys from the rightmost). This range is one note less than 5 octaves. D2 to D6 is 4 octaves so perhaps you meant C6.
His range, going by what you wrote, is most of the notes on a piano but that is NOT all possible notes in music or playable by musical instruments. But it is a good enough estimate that his vocal range cover half of the notes available in an orchestra (typically 8-9 octaves, give or take)
Hard to say what his normal speaking voice is. Not sure it is related to a vocal range.
Anyway, vocal range is a bit of a “bragging rights” thing and isn’t as important as a number of people think. Arguably more important is a singer’s tessitura, broadly defined as the comfortable singing range. (where they maintain good timbre, able to project power etc)
Some singers can produce a high “whistle” (eg. Mariah Carey) and control the note but it hard to say that it is singing in some sense. (it always sounds like “eeeeee”) IMHO
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