Custom Port Scanner and Network Mapping Tool

Network security assessment is a critical process for identifying vulnerabilities within computer systems and connected devices. Port scanning and network mapping are widely used techniques to discover open ports, active hosts, and running services in a network. Although several advanced tools such as Nmap are available, they are often complex and not user-friendly for beginners. This paper presents the design and implementation of a Custom Port Scanner and Network Mapping Tool developed using Python. The proposed system allows users to scan IP addresses and domains to detect open, closed, and filtered ports while identifying connected devices within the network. The tool integrates scanning techniques with a graphical user interface to visualize scan progress and results clearly. Experimental evaluation demonstrates that the developed tool provides accurate detection with efficient performance. The proposed system simplifies network security assessment and serves as an educational platform for cybersecurity learners and professionals.