cyrus-nntptest(1) on Linux
The text 0616aa01d1c3, as Debian 13 (Trixie) shipped it. The page shows this text now.
Cyrus IMAP documentation Interactive NNTP test program. This is actually installed as a hard linked copy of imtest(1). It allows you to authenticate and send NNTP commands to the server. nntpd(8)