Website Availability Checker

Check if a website is up or down from multiple sources. This tool tests website availability using independent APIs and direct connection attempts, giving you a reliable answer even if one source fails.

What Is Website Availability?

Website availability refers to whether a website is accessible and responding to requests from the internet. A website can be "up" (available) or "down" (unavailable) due to various factors like server issues, network problems, DNS failures, or maintenance.

How Does This Tool Work?

This tool uses multiple detection methods with automatic failover:

• isitup.org — Primary source, checks HTTP status from external servers
• down.com — Fallback source with independent verification
• Direct fetch — Attempts direct connection from your browser
• Cloudflare DNS — Verifies domain name resolution

If one source fails, the tool automatically tries the next. CORS proxies ensure cross-origin requests work from your browser.

Common HTTP Status Codes

Why Do Websites Go Down?

• Server overload — Too many visitors or DDoS attacks
• Maintenance — Scheduled updates or server migrations
• DNS issues — Domain name fails to resolve to an IP
• Network problems — ISP or routing issues
• SSL certificate expiry — HTTPS becomes invalid
• Hosting provider outage — Data center issues

Limitations

• Rate limits — Free APIs have usage limits; excessive checks may be temporarily blocked
• Geographic variance — A site may be accessible from one country but blocked in another
• CDN caching — Results may reflect cached responses rather than real-time status
• Single point in time — Status can change seconds after the check
• CORS restrictions — Direct browser checks are limited by cross-origin policies