Free Developer & Network Tools
A collection of 18+ free online tools for developers, DevOps engineers, and network administrators. No sign-up required, all tools run directly in your browser.
Network Tools
DNS, SSL, WHOIS, and connectivity testing tools
DNS Lookup
Query DNS records (A, AAAA, MX, TXT, NS, CNAME) for any domain
SSL Checker
Verify SSL certificate validity, expiry date, and chain details
WHOIS Lookup
Get domain registration details, owner info, and expiry dates
HTTP Headers Checker
Inspect HTTP response headers, status codes, and timing
Port Scanner
Check if specific ports are open on a host or server
IP Geolocation
Find geographical location, ISP, and organization for any IP
Ping Test
Test server connectivity and measure response latency
Developer Tools
Calculators, generators, and formatters for developers
Subnet Calculator
Calculate IP subnets, CIDR notation, network ranges, and hosts
Uptime Calculator
Convert uptime percentages to downtime duration (daily/monthly/yearly)
Crontab Generator
Build and validate cron expressions with a visual editor
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting
Regex Tester
Test and debug regular expressions with real-time matching
Timestamp Converter
Convert between Unix timestamps and human-readable dates
Utility Tools
Encoding, hashing, and reference tools
HTTP Status Codes
Quick reference guide for all HTTP status codes and meanings
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for any text
Base64 Encoder/Decoder
Encode and decode Base64 strings for data transfer
URL Encoder/Decoder
Encode and decode URL parameters and special characters
User Agent Parser
Parse and analyze browser user agent strings