Check port numbers and view common service ports database. Includes well-known, registered, and dynamic ports.

Convert between binary, hexadecimal, octal, and decimal instantly. Essential for low-level programming and debugging.

Full ASCII table reference and Unicode character inspector. Lookup codes, entities, and character details.

Calculate subnets, CIDR ranges, broadcast addresses, and host capacities. Free online subnet calculator for network engineers.

Safely decode and inspect JSON Web Tokens (JWT). View the header and payload claims in a formatted, readable JSON view, verify signature existence, and check token expiration—all client-side without transmitting sensitive tokens.

Generate and validate cron expressions. Predefined presets and custom builder for task scheduling. Free online crontab generator for developers.