TCP/IP user commands that may be used to display various network-related information

hostname 
Display the name of the local system

ifconfig 
Display information about network interfaces (also configure them)

ping 
Perform a simple network connectivity test

arp 
Display or modify the IP-to-MAC address-translation tables

netstat 
Display various network usage statistics

route 
Display or modify the static routing tables

traceroute 
Determine the route to a specified target host

nslookup 
Determine IP address-to-hostname and other translations produced by the Domain Name Service