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Magic Numbers https://en.wikipedia.org/wiki/Magic_number_(programming)

Hexspeak https://en.wikipedia.org/wiki/Hexspeak

We don't really need a website to do it:

grep -i '^[0-9a-f]*$' /usr/share/dict/words

I'd say you might want to grep for [0134567] instead (being charitable) and maybe use sed y command to find the l33t equivalences

0 - o

1 - I

3 - E (redundant)

4 - A (redundant)

5 - S

6 - G

7 - T

IIRC Facebook uses IPv6 addresses that have face:b00c in them

Apple uses a bunch of hexspeak for error codes in iOS, including 8BADFOOD ("ate bad food"), C00010FF ("cool off" - related to thermal events), and DEAD10CC ("deadlocc" - deadlock).

There's also DEFEC8ED ("defecated"), which was used by OpenSolaris for core dumps.