433 for those who didn't know (like me)

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

> The Network News Transfer Protocol (NNTP) is an application protocol used for transporting Usenet news articles (netnews) between news servers, and for reading/posting articles by the end user client applications.

> Well-known TCP port 433 (NNSP) may be used when doing a bulk transfer of articles from one server to another.

on many unix variants, /etc/services lists the ports and normal uses

Yes. I meant port 443.