Intellectual Properties reuse has gained widespread acceptance in System-On-Chip design to manage the complexity and shorten the time-to-market. However the need for a standard representation that permits IPs classification, characterization, and integration is still a big challenge. To address this problem, we propose to develop an IPs reuse specific ontology that facilitates IPs reuse at many levels of abstraction and independently from any design language or tool. Our ontology is built using the Protégé-OWL tool