> This is handled by IP, the Internet Protocol, whence IP addresses.

This is grammatically nonsense. Correct would be “whence IP addresses come”. Or, “from where IP addresses come”, if you want to write like somebody normal

One of my biggest pet peeves is when someone uses obscure words like “whence” in an effort to flex their knowledge - and it’s even worse when they actually use it wrong. Almost made me stop reading the article. Although I’m glad I didn’t, because the rest of the article is great.