I thought it was neat how this helped me understand that IPv4 addresses are represented in a in_addr_t using just 4 bytes.
https://memory-spy.wizardzines.com/game.html#example=convert...
https://memory-spy.wizardzines.com/game.html#example=convert...
http://0xd1d8e6f0 http://3520653040
I made a short Go thingy to help you play around with this if you'd like: https://play.golang.com/p/Rybs_gwzLym