Tools & calculators

Subnet / CIDR Calculator

Network, broadcast, host range, mask, and host count from an IP and prefix.

CIDR Calculator

Expand any IP and CIDR prefix into its full network details.

Subnet Mask Cheat Sheet

Every CIDR prefix /0 to /32 with mask, wildcard, and host counts in one table.

VLSM Calculator

Pack a network into variable-size subnets from your per-subnet host counts.

MAC Address Lookup

Find the hardware vendor behind any MAC from the IEEE OUI registry.

RAID & ZFS Storage Calculator

Usable capacity, parity, efficiency, and fault tolerance by disk count and layout.

ZFS Calculator

Usable RAIDZ pool capacity, parity overhead, and how many disks can fail.

Data Unit Converter

Convert between bytes, GB, TB and KiB, MiB, TiB plus bits. Settles TB vs TiB.

Power & Cost Calculator

Total watts, daily kWh, monthly and yearly cost, plus a UPS runtime estimate.

Reverse Proxy Config Generator

Ready-to-paste Caddy, Nginx, or Traefik config from a domain and upstream.

WireGuard Config Generator

Matching client and server configs with keys generated in your browser.

docker run to Compose

Convert a docker run command into a compose.yaml service.

Password Generator

Strong random passwords with an entropy readout, generated in your browser.

htpasswd Generator

bcrypt or SHA-1 .htpasswd entries for Nginx, Traefik, and Caddy basic auth.

Hash Generator

MD5, SHA-1, SHA-256, and SHA-512 of any text, computed as you type.

Crontab Generator

Build a cron expression and read back in plain English when it runs.

Base64 Encode / Decode

Convert text to and from Base64, with a URL-safe option.

UUID Generator

Generate one or many random v4 UUIDs with copy-all.