Practical calculators and utilities for storage, backups, certificates, networks and everyday system administration. Choose a tool to open its dedicated page.
Calculators, planners, cron schedules, timestamps and public lookup tools include browser-saved presets and shareable settings links. DNS record templates save options without record content; maintenance presets omit titles and impact notes. Passwords, logs, configurations, e-mail headers, reports and IP range lists are excluded from presets and shared links. Result panels offer Text, CSV and JSON exports, alongside specialised downloads where available. Passwords are excluded from the shared export controls.
Backup retention calculator
Estimate storage for full and incremental backup chains, archives and additional copies.
Open tool →Backup window planner
Schedule backup jobs against shared bandwidth, concurrency and a transfer deadline.
Open tool →Certificate checker
Inspect the HTTPS certificate served for a public hostname and check expiry, hostname and TLS verification.
Open tool →Configuration comparison
Compare configurations line by line and highlight changes.
Open tool →Cron schedule helper
Explain a five-field cron expression and preview its next eight scheduled times.
Open tool →HTTP header checker
Inspect response headers, redirect hops and common browser security policy headers.
Open tool →IP range comparison
Compare IPv4 and IPv6 lists for overlaps, differences and address membership.
Open tool →Log analyser
Filter local logs, inspect severity and identify repeated messages.
Open tool →Maintenance window planner
Plan maintenance across time zones and export a calendar event.
Open tool →Password generator
Generate secure passwords locally with adjustable length and character types.
Open tool →RAID capacity calculator
Estimate usable storage, parity or mirror overhead, and disk-failure tolerance.
Open tool →Storage growth planner
Estimate when storage reaches a warning threshold or full capacity.
Open tool →Subnet calculator
Calculate IPv4 networks, subnet masks, host ranges and broadcast addresses.
Open tool →Timestamp converter
Convert Unix timestamps and ISO dates into UTC and other time zones.
Open tool →Transfer time calculator
Estimate transfer duration from data size, speed and expected utilisation.
Open tool →Uptime calculator
Calculate downtime budgets and measured availability for any period.
Open tool →For domains and DNS records, visit DNS Tools →. For mail diagnostics, visit E-mail Tools →.