Linux Tools

Interactive, client-side tools for Linux and DevOps work: permission calculators, subnet planners, cron expression builders, and more. Calculations run locally in your browser.

Crontab GeneratorInteractive crontab expression generator. Type a cron expression to get a plain-English explanation and the next five run times, or build one from presets and per-field dropdowns. Subnet CalculatorInteractive IPv4 subnet and CIDR calculator. Enter a network in CIDR notation to get the network and broadcast address, usable host range, netmask, wildcard mask, and a binary bit view, then split the block into smaller subnets. chmod CalculatorInteractive chmod permission calculator. Toggle read, write, and execute bits to get the octal and symbolic notation, plus the exact chmod command to run.