PortScanner Tool enables a Network Administrator to find the open port on a remote server. This project is developed in C language and makes use of raw-socket programming. This tool supports IPv4 and can perform six types of scans namely TCP SYN, NULL, FIN, Xmas, ACK scans and UDP scan. This basic tool stores the results of each scan and makes a conclusion on whether a port is open, closed, filtered, unfiltered or open-filtered. Along with these scans it also finds the version of service running on few pre-defined standard ports like SSH, Whois, HTTP etc.,