At present, many people always connect to the network by their own portable computers. And more likely increasing number of usage in the future inside Kasetsart University Sakon Nakhon Province Campus. When they connecting to the University network to access the information for classes or taught by the way the device might be possible get lost or stolen. In this Kasetsart University Sakon Nakhon Province Campus have no tracking system that get lost device yet. And could it possibly that the portable computer reconnected on the Kasetsart University Sakon Nakhon Province Campus Network. The System developed for tracking and searching Mac Address of that device in every five minutes within the Intranet. By using a Protocol SNMP with situation simulation case studies Kasetsart University Sakon Nakhon Province Campus and still developed with the Operating System (Ubuntu), PHP Language, Database Management Program (MySql), Apache Web Server Program, Crontab and so on.