NetworkCalc is a powerful browser extension designed for network professionals and enthusiasts, providing a suite of tools for IP address management and analysis. It supports both IPv4 and IPv6, allowing users to perform subnet calculations, CIDR-to-netmask conversions, and even IPv6 subnet splitting and address expansion. Additionally, MAC address tools enable vendor lookups, enhancing the utility's functionality for various networking tasks.

In addition to IP and MAC address capabilities, NetworkCalc also includes encoding and decoding features for Base64, Hex, URL, ASCII, and MD5, making it a versatile tool for technical users. The extension operates entirely locally, ensuring user privacy without any cloud dependency or tracking. While some advanced features may require a license key, the core functionalities remain accessible for free, making it a valuable resource for network engineers, system administrators, and students alike.