Domain Tools
4 free domain utilities. No signup, no ads, instant results.
Website Down Checker
Check if any website is down or just you. See HTTP status code, response time, and server availability instantly.
IP Address Lookup
Find your public IP address, location, ISP, timezone and hostname instantly. Also look up any IP address for geolocation data.
SSL Certificate Checker
Check any website's SSL certificate. See validity, days until expiry, issuer and covered domains. Free, instant, no signup.
WHOIS Domain Lookup
Check domain registration date, expiry, registrar and nameservers. See who owns any domain — free, instant.
Professional Utilities: Instant, Free, and Secure
ToolStack was built to eliminate the friction from everyday digital workflows. We provide a comprehensive suite of professional utilities designed to save you time, reduce errors, and improve the quality of your output. We firmly believe that essential tools should be freely accessible, which is why we never hide features behind paywalls or demand account registrations.
Every tool in this category has been rigorously engineered to prioritize speed and privacy. Where possible, logic is executed entirely on your local device—meaning your data remains yours. For our AI-assisted features, we utilize enterprise-grade APIs to ensure maximum accuracy and reliability. Explore the tools above to streamline your daily tasks.