Maybe it hold the maximum TCP connections in a single FreeBSD machine

A telnet-based BBS, Ptt(Professional Technology Temple), which can mostly be logined with telnet://ptt.cc, a single FreeBSD machine, may hold more than 61,000 TCP connections at the rush hour of everyday. Now, about 17:00, Oct 22, timezone +0800, it is holding 55090 TCP connections at the same time.