Nmap

SSL/TLS

Find supported ciphers for a website

nmap --script ssl-enum-ciphers -p 443 google.com

Find local IP address

Find local IP address (Mac)

ipconfig getifaddr en0

Alternative (without the need to know the network)

ifconfig -l | xargs -n1 ipconfig getifaddr

Find local IP including subnet (/24 for example)

ip addr show en0 | grep "inet\b" | awk '{print $2}'

Find gateway IP address

route -n

via ip command

ip route show default

nmap

Scan (sn: Skip port scan, oG: Grepable output)

nmap -sn -oG - 192.168.178.0/24

Scan (automatically detect network range, one-liner)

nmap -v0 -sn -oG - `ip addr show en0 | grep "inet\b" | awk '{print $2}'`