Free Browser-Based Tools for
IT Admins & Sysadmins
No signups, no paywalls, no fluff — just fast, reliable utilities that run entirely in your browser.
Network & Infrastructure
Subnet calculators, DNS lookups, IP tools, and other network utilities.
Subnet/CIDR Calculator
Calculate network address, broadcast address, usable hosts and more from any IP/CIDR input.
IP Address Converter
Convert between decimal, binary, hex, and integer IP address formats.
CIDR Range Visualiser
Visualise IP ranges and see overlap between CIDR blocks.
VLAN Calculator
Plan VLAN subnetting and calculate usable address ranges.
Bandwidth Calculator
Convert between bandwidth units and estimate transfer times.
Port Reference
Quick reference for common TCP/UDP ports and their services.
Developer Utilities
Encoding, formatting, generation, and conversion tools for developers.
JSON Formatter & Validator
Format, validate, and minify JSON instantly. Shows precise error locations for invalid input.
Base64 Encoder/Decoder
Encode and decode Base64 strings instantly.
UUID Generator
Generate v4 UUIDs in bulk with one click.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any input.
Regex Tester
Test regular expressions with real-time matching and group highlighting.
Cron Expression Parser
Parse and validate cron expressions with human-readable descriptions.