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errno.help icon

errno.help

errno.help is a free, text-first collection of IT and developer reference tools: a CIDR/IPv4 calculator, JWT decoder, hash generator (SHA-256/1/MD5), UUID and password generator, YAML/JSON converter, cron parser, DNS/WHOIS/ASN/GeoIP lookups, a Windows error code and event ID...

The CIDR/IPv4 calculator - enter a network in CIDR notation and get the network address, broadcast, subnet mask, and usable host range instantly.

Cost / License

  • Free
  • Open Source (MIT)

Platforms

  • Online
The full tool directory, grouped by category: Network & security, Encoding & data, and Windows & commands.
The home page - a plain, text-first overview of all available tools, no login or clutter.
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Development, Network & Admin, OS & Utilities

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What is errno.help?

errno.help is a free, text-first collection of IT and developer reference tools: a CIDR/IPv4 calculator, JWT decoder, hash generator (SHA-256/1/MD5), UUID and password generator, YAML/JSON converter, cron parser, DNS/WHOIS/ASN/GeoIP lookups, a Windows error code and event ID lookup, and command builders for Robocopy, chmod, and kubectl. Most tools run entirely in the browser with no account required and no tracking. Open source under the MIT license.