Free tools
Handy utilities for sysadmins, developers and network engineers. Free, no sign-up, and everything runs in your browser.
Cron Expression Generator
Build cron schedules visually, decode any expression into plain English, and see the next 10 run times in your timezone or UTC.
0 9 * * 1-5 At 09:00 on weekdays
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Subnet Calculator
IPv4 and IPv6: network, broadcast and host range, netmask and wildcard, binary view, subnet splits and MikroTik, Cisco and Linux config.
192.168.10.0/24 254 usable hosts
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Monitor what you've configured.
Websites, APIs, routers, ports and cron jobs: Upwatch checks them around the clock and tells you first when something breaks.