cheat sheets.

nmap
    Network exploration tool and security / port scanner

    -- basic fast scan
    nmap -F target.host.com

    -- multiple hosts
    nmap -sS host1.target.com host2.target.com

   -- Ping scan: whats on the network?
   nmap -sn 10.0.0.0/24

   -- Aggressive all-ports scan (no ping, no DNS)
   nmap -sS -PN -n -T4 -p- target.host.com

   -- Advanced target designation
   nmap -sS 192.168.1,3.1-10

   -- Full scan with OS detection, version detection, script scanning and
   traceroute
   nmap -A -T4 target.host.com