nmap

EXAMPLES:
 nmap -sR -p 1-65535 servername (RPC scan on all TCP ports)
 nmap -sR -sU -p 1-65535 servername (RPC scan on all UDP ports)

 Find hosts on a network
 nmap -sL network
 Find if host is up on a network
 nmap -sP network
 Find open TCP ports on a host without pinging and determine host OS
 sudo nmap -sT -PN -O serverIP
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