Tcpstat reports certain network interface statistics much like vmstat does for system statistics. tcpstat gets its information by either monitoring a specific interface, or by reading previously saved tcpdump data from a file. Tcpstat is written with performance and efficiency in mind and is capable of handling large amounts of packets per second. Its compact command line interface is geared for the network researcher, system administrator and desktop shell user. Tcpstat has been a valuable tool in university research papers and commercial networks alike.