[tcpip-unp] is a network utility tool that displays the local host's network connections for transmission control protocol ((both incoming and outgoing), routing tables, and a number of network interface and network protocol statistics. it is used for finding problems in the network and to determine the amount of traffic on the network as a performance measurement. this command is used to find which tcp port is bound or free so that one may choose a free port for one's server to bind and listen.