NetEng Sidekick: Subnet Calculator is a specialized tool designed for network engineers, sysadmins, and cloud architects. This Chrome add-on offers a user-friendly side panel that keeps subnet calculations visible while users work on configurations, audits, or designs. It supports both IPv4 and IPv6, providing precise calculations for a variety of network scenarios, including CIDR and VLSM. The tool allows for smart input, handling both CIDR and legacy formats seamlessly, ensuring effortless integration into existing workflows.

One of the standout features is its offline capability, making it reliable even in air-gapped environments. Users can quickly export their calculation results for documentation purposes, enhancing efficiency in project management. With additional functionalities like visual VLSM breakdowns and one-click copying of essential IP addresses, NetEng Sidekick is tailored for the daily tasks of network professionals, ensuring they can focus on their work without losing critical information.