A computer network consists of a group of computers that are linked with one another which share the resources. Data packets are generally used to transfer the data among these nodes. When a large volume of data in a network is divided into smaller sub portions, they are called as data packets. It is an important task to analyse different packets of data when they are shared across a network without any supervision. This is a situation where packet sniffer is used. Packet sniffer is a tool that is usually used in network monitoring to analyse all the incoming and outgoing data packets. The aim of this paper is to develop a packet sniffing tool from scratch using python, networking and cloud knowledge. It also focuses on developing a standalone tool that consumes little memory on the hard disk.