If this is a subject that interests you, I highly recommend the book Where Wizards Stay Up Late[0]. This blog post really just scratches the surface. And if reading about network protocols is your kind of thing, I definitely suggest reading the RFC[1].
I found the beginning of RFC 47 (linked from RFC 33) also interesting [1]:
> BBN's Comments on NWG/RFC #33
> BBN has given us the attached comments on NWG/RFC 33, but wouldn't
publish them being relectant to embarrass us. Embarrassment notwith-
standing, we found the comments particularly useful and decided to share
them with our friends. Bill Crowther is the author.
0. https://www.goodreads.com/en/book/show/281818
1. https://www.rfc-editor.org/rfc/rfc33.html
edit: formatting