Website Down Checker

Check if a website is online and responding to requests. Test HTTP (port 80) and HTTPS (port 443) connectivity, measure response times, and verify DNS resolution. Real-time status checking with visual indicators (green for online, red for offline). Response time measurement in milliseconds. DNS resolution check showing IP addresses. Overall website status summary. Detailed results for each protocol checked. Educational information about uptime monitoring, response time measurement, and DNS checking. Perfect for website administrators, developers, and users checking if a site is accessible. Supports checking with or without https:// prefix. Automatic URL normalization. Multiple check options: HTTPS, HTTP, and DNS resolution can be toggled individually.