About hexadecimal geocodes?

[ppKrauss]

Suggestion to use base16h to represent your grid-cells in a hierarchical geocode...

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See illustration here (it runs only on desktop Firefox or Chorme).

It is possible to use positional notation for hierarchical entities. Instead to use base4, base8 or base16 (hexadecimal) you must to use base4h, base8h or base16h.

You can apply it in Hilbert (U) or Morton (Z) space-filling curves.
For example on Hilbert with base16h:

The first (1 digit) and the lest (2 digits) are pure hexadecimal representations. The other are intermediary and half levels... All preserving predixes and its location.