Reference Tools

Reference tools give you fast, searchable answers you would otherwise have to look up: every HTTP status code, cron expressions translated into plain words, Unix file permissions built visually, and IPv4 subnet maths worked out for you.

HTTP Status Codes Searchable reference for all HTTP status codes. Cron Parser Parse cron expressions into human-readable form. Builder included. chmod Calculator Build Unix permissions: checkboxes, octal and symbolic views. IP Subnet Calculator Network, broadcast, mask and host ranges for any IPv4 subnet.