Chris: Yeah, I find it interesting academically, but I really don't use it.
Andreas: Ah, that's a very good point, I hadn't thought of those. Thanks :)
Meketrefe: I definitely did binary at school, and hex at university - but most web developers aren't using these skills and have forgotten the detail of how it all works over time. My hope is that this post will serve as a quick refresher!
Hilary: I did not know that, thanks for the interesting information.
Richard: That's also a valid use case; it's niche but as you say, quite easy to stumble across it