Netstat

Use netstat to check listening ports on Windows. Useful to learn whats normal.

netstat -ab | FIND "LISTEN"
netstat -a #ALL# -o #PID# -n #ADDRESS&PORTS#
    
DNS lookup

dig @8.8.8.8 brooksmacdonald.com MX

 
Reverse DNS lookup

dig -x 212.58.244.26