Network CLI Utilities

Shows the multicast groups that the host already joined in

netstat -ng (Linux)
netsh interface ip show joins (Windows / RRAS service needs to be enabled and started)

Shows UDP/TCP/IP statistics

netstat -su (Linux)
netstat -st (Linux)
netsh interface ip show udpstats (Windows)
netsh interface ip show tcpstats (Windows)
netsh interface ip show ipstats (Windows)

ping+traceroute on steroids
lft (Linux - stands for Layer4 traceroute)
pathping (Windows)