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A simpler version of a CONCATENATE method in Excel is:
=CONCATENATE(BITAND(H2, 255), ".", BITAND(ROUNDDOWN(H2 / 256, 0), 255), ".", BITAND(ROUNDDOWN(H2 / 256^2, 0), 255), ".", BITAND(ROUNDDOWN(H2 / 256^3, 0), 255))