Indoor Tracking System with Indoor Location-Based service (ILBS) is a system that provides an indoor object tracking solution. This system is composed of BLE Location beacon and gateway and sever. This thesis focuses on the design, architecture, and implementation of an Indoor Tracking System (ITS). Shows the ILBS server handles the tracking data received from the gateways and how it processes the data, and an object-tracking application based on the ITS. And several APIs are provided by the server for application developers. The APIs are easy to learn and memorize, and easy to extend so different types of application can be easily written.