Network Investigation Toolkit (NIT) is designed specially by Decision Group for LEA such as Police, Military, Criminal Investigation Agencies, National Security Agencies, Cyber Security Agencies, Counter Terrorism Department, Forensics Investigator etc. to conduct network based forensics investigation whether it is on a Wired or Wireless LAN networks. NIT is a portable unit (laptop based) with comprehensive network forensics features which can be carried at any location for network based investigation task. NIT can be used to intercept on targeted networks or users to collect the necessary evidences and trace out the source of communication. The unique capability of this system is its combination of various features and functions to conduct LAN real-time interception, WLAN real-time interception, HTTPS/SSL MITM interception on both LAN and WLAN networks as well as offline analysis and reconstruction of pre-captured raw data files. The 3.5G/HSDPA USB Adapter is included in the package for user to remote access and manage the system.