scanning port state whether opened, closed or filtered by using nmap

[root@localhost ~]# nmap -sT -p 1-65535 localhost

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2008-02-19 01:47 KST
Interesting ports on xxx.xxx.xxx.xxx:
Not shown: 65531 closed ports
PORT    STATE SERVICE
22/tcp  open  ssh
80/tcp  open  http
111/tcp open  rpcbind
645/tcp open  unknown
ref: http://kldp.org/node/91134





Nmap finished: 1 IP address (1 host up) scanned in 2.391 seconds