NS (name server) Look Up is used to translate a DNS hostname into an IP address.
Traceroute is used on TCP/IP networks to determine the route of the packets sent to a particular host.
Ping is a tool used on TCP/IP networks (like the internet). Ping tests wether a particular hostname or IP is operating an reachable on the network.
Domain Availability Check
(eg. to search for www.yourdomain.com, just type 'yourname')