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root@db1-smallcity:/etc/network# nmap -p 22 192.168.1.0/24

Starting Nmap 4.62 ( http://nmap.org ) at 2010-03-19 00:32 EDT
Interesting ports on 192.168.1.1:
PORT   STATE  SERVICE
22/tcp closed ssh
MAC Address: 00:0C:41:AA:AE:62 (Cisco-Linksys)

Interesting ports on 192.168.1.20:
PORT   STATE  SERVICE
22/tcp closed ssh

Interesting ports on 192.168.1.100:
PORT   STATE    SERVICE
22/tcp filtered ssh
MAC Address: 00:22:15:10:58:33 (Unknown)

Interesting ports on 192.168.1.101:
PORT   STATE  SERVICE
22/tcp closed ssh
MAC Address: 00:0F:3D:BA:CA:C1 (D-Link)

Interesting ports on 192.168.1.105:
PORT   STATE  SERVICE
22/tcp closed ssh
MAC Address: 00:1D:60:AC:07:B5 (Asustek Computer)

Interesting ports on 192.168.1.121:
PORT   STATE  SERVICE
22/tcp closed ssh
MAC Address: 00:11:2F:7C:11:5C (Asustek Computer)

Interesting ports on 192.168.1.131:
PORT   STATE  SERVICE
22/tcp closed ssh
MAC Address: 00:19:5B:44:04:B3 (D-Link)

Nmap done: 256 IP addresses (7 hosts up) scanned in 41.551 seconds
root@db1-smallcity:/etc/network#