LaboratorU
Networks/system
Local IPv4, Unix permissions, numeric base, cron, and browser-header helpers for admin workflows.
CIDRCalculate IPv4 network, broadcast, mask, wildcard, address count, and usable range locally.IP RangeConvert IPv4 addresses to decimal/hex and summarize inclusive IPv4 ranges as CIDR blocks locally.chmodConvert Unix permission modes and umask values into readable owner, group, and other permissions locally.Base / FloatConvert numbers across decimal, hex, binary, octal, and inspect IEEE-754 float encodings locally.CronExplain common five-field cron expressions locally without scheduling jobs or calling a provider.HeadersParse pasted User-Agent and Accept-Language headers into best-effort browser, OS, device, and language signals locally.