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What's new: • Fixed: links (Website reachable banner, A/AAAA record links, "More Systron tools") now open correctly on Android 11+ • Improved WHOIS/RDAP lookup with legacy Port 43 fallback • Fixed .com/.net Verisign RDAP endpoints • Reverse DNS (PTR) for IP addresses • Copy button on every field • Dark mode (Light/Dark/Follow System)
Instant WHOIS lookups for domains & IPs. Fast, secure, and easy to use.
Systron Whois Tool is a secure, lightweight, and fast application designed to look up domain registration data, IP assignments, and infrastructure ownership instantly. Built for network administrators, cybersecurity enthusiasts, and everyday web users, it delivers comprehensive public networking records with complete privacy. By bridging modern architecture with core internet standards, the app ensures total coverage across the global registration ecosystem. KEY FEATURES - Advanced Protocol Support Fully compliant with the latest WHOIS RFC standards for structured data query handling. - Legacy Port 43 Integration Built-in support for direct legacy Port 43 query lookups, ensuring seamless compatibility with traditional registry servers. - Complete WHOIS Records Check domain availability, registration history, expiration dates, registrar information, and administrative contacts instantly. - IP & DNS Lookups Perform lookups on IPv4 and IPv6 addresses to analyze network routes and server ownership. - Local History Management Access your past lookups locally on your device with complete privacy, no online history sync, tracking, or telemetry. - Safe & Optimized Layout Enjoy a beautifully stylized interface with responsive, dark-mode-ready visual components. ABOUT SYSTRON This app is part of the Systron ecosystem, complementing our web platform's suite of developer utilities, server configuration converters, email authentication checkers, and network diagnostic tools. Secure your network mapping and run completely private web infrastructure analysis today with Systron Whois Tool.