In the context of Cognitive Radio, spectrum occupancy estimate of a geographical region is very important to develop strategies to utilize the unoccupied spectrum. Most of the spectrum occupancy measurements carried out till date are based on measurements at outdoor high points. In this work, spectrum occupancy is measured in an indoor setup. An attempt is made to find the utility of the licensed spectrum in the region of Kochi, India. For this purpose spectrum activity within the range 50MHz-4400MHz is recorded and presented as psd plots. Spectrum holes in the frequency-time domain is obtained through detailed measurement at certain frequency bands where activity is noticed. Average duty cycle of certain channels and specific bands are also analyzed. Results reveal that CRs with different complexity can work at different types of spectrum holes. This implies that a high end device with multiple protocols can adapt to any type of spectrum holes. There is also the possibility that a low end CR device specific to the type of spectrum hole can exist and perform certain specific functions.