Abstract: The article deals with IP address illegal usage at campus network management. After deeply analyzing IP address management process and evaluating some traditional methods for preventing IP address abuse, the authors provided by means of comprehensively using SNMP, Java and SQL Server the “IP address network supervising system”, i.e. timely reading the ARP data from network server and MACPORT data info from users’ switch and comparing them with user basic data find the IP address illegal usage, lock the port and record this to prevent the IP address embezzlement action and achieve the supervise and management to network.

Key words: IP address embezzlement, MAC address, simple network management protocol (SNMP), Java, IP network monitoring