dictd local server secure?

[BartlebyScrivener <bscrivener42@gmail.com>]

I've been on Etch for about a year. Still learning ins and outs. I
installed the dictd server for local use only (I hope). I'm behind NAT
router etc, but when I do nmap on local network, it says:

Not shown: 1677 closed ports
PORT     STATE SERVICE
111/tcp  open  rpcbind
113/tcp  open  auth
2628/tcp open  dict

I installed the dict server only for my local machine, so wondering
why it shows open?  If anybody has experience in this please advise or
point to more reading.

Thank you,

rd