http://nmap.org/book/man-port-scanning-basics.html
-Pn is "no ping"
# use nmap to scan port range
nmap -Pn -p 22-22 9.2.226.125
# or nc
nc <ip> <port>
# or sinlge port
nmap -Pn -p 22 9.2.226.125
# full scan is
-p 1-65535
# home scan:
silesia-mac:~ sabath$ nmap -Pn -p 1-65535 32.216.129.147
Starting Nmap 6.47 ( http://nmap.org ) at 2014-12-10 17:49 EST
Nmap scan report for 32.216.129.147
Host is up (0.0045s latency).
Not shown: 65521 filtered ports
PORT STATE SERVICE
25/tcp closed smtp
80/tcp open http
135/tcp closed msrpc
139/tcp closed netbios-ssn
445/tcp closed microsoft-ds
1214/tcp closed fasttrack
3128/tcp open squid-http
5554/tcp closed sgi-esphttp
6346/tcp closed gnutella
8080/tcp open http-proxy
8866/tcp closed unknown
8998/tcp closed unknown
9996/tcp closed unknown
50001/tcp closed unknown
Nmap done: 1 IP address (1 host up) scanned in 163.65 seconds