Nmap

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Ping Lan Address Range and Report who is Active

$ nmap -sP 192.168.1.0/24

Get DHCP Servers in LAN

$ sudo nmap --script broadcast-dhcp-discover -e eth0

Basic searches

The second thing to remember with nmap and searches. -T is tcp. -U is udp. -P is a ping (check that host is alive) test. So remembering these three simple switches, gives you the following commands

$ nmap -sP          192.168.1.0/24
$ nmap -sT -p1-1000 192.168.1.0/24
$ nmap -sU -p1-1000 192.168.1.0/24