Tools

Free, client-side networking utilities. Everything is computed locally in your browser — nothing is uploaded, nothing tracks you.

• IPv6 address calculator

  Convert an IPv6 address between compressed and fully expanded forms, and identify its type (loopback, link-local, ULA, global unicast, mapped, …).

• IPv4 subnet calculator

  Enter an IP/prefix to get the network, broadcast, netmask, usable host range and host count — plus the address type.

• Number base converter

  Convert between binary, octal, decimal and hex, see the 64-bit layout and the signed value at each width, and toggle individual bits.

• Endianness visualizer

  See the same integer or float laid out in bytes under little- and big-endian, with the IEEE-754 field breakdown.

• CRC calculator

  CRC-32, CRC-32C, CRC-16/MODBUS, CCITT, XMODEM and CRC-8 over text or hex bytes.

• chmod calculator

  Octal ⇄ symbolic file modes, including setuid/setgid/sticky, with the equivalent command.

• Base64 / URL / Hex encoder

  Encode and decode Base64, URL percent-encoding, hex and HTML entities on UTF-8 bytes.

• cron explainer

  Turn a 5-field cron expression into plain English plus the next five run times.

• systemd hardening generator

  Tick the hardening you want and get a paste-ready unit file — with the cost of every directive written next to it.

More tools are coming. If there is one you wish existed, get in touch.