Website Availability Checker – Full Availability Test Free Online
Check DNS resolution, HTTPS availability, HTTP response, and response time for any website. Instant multi-signal availability test. Free.
What is Website Availability Checker – Check if a Website is Accessible?
A website availability checker performs a comprehensive multi-signal check on any URL: DNS resolution (can the domain be found?), HTTPS certificate validity, HTTP response code, server response time, and final URL after redirects. Unlike a simple uptime ping, this test reveals exactly which layer of the stack is failing when a site is unreachable.
How to Use Website Availability Checker – Check if a Website is Accessible
- 1Enter the URL of the website you want to test.
- 2Click Check Availability to run all tests.
- 3Review each check: DNS, HTTPS, HTTP status, response time.
- 4Any failing checks show a red indicator with the failure reason.
- 5Use the details to diagnose whether the issue is DNS, SSL, or server-side.
Key Features
- ✓DNS resolution check
- ✓HTTPS and SSL certificate validation
- ✓HTTP response code check
- ✓Server response time measurement
- ✓Final URL after redirect chain
Benefits
- →Diagnose exactly what's failing when a site is unreachable
- →Verify new deployments are fully accessible
- →Confirm DNS propagation has completed
- →Check HTTPS is working after SSL certificate renewal
Why Use Irreva for Website Availability Checker – Check if a Website is Accessible?
Frequently Asked Questions
What checks does this tool perform?
It checks four things: DNS resolution (can the domain name be resolved to an IP?), HTTPS availability, HTTP response code, and response time. All four give a comprehensive view of a site's availability.
What is the difference between uptime and availability?
Uptime typically refers to a single up/down check. Availability is broader — it includes DNS resolution, HTTPS, and actual HTTP response. A site can have DNS but return a 503, meaning DNS is up but the site is not available.
Why might DNS resolve but the site still be unavailable?
DNS resolution only means the domain name maps to an IP. The web server at that IP may be down, misconfigured, returning errors, or blocking the request from the proxy server.
Is this a replacement for uptime monitoring services?
No. This is a single point-in-time check. Dedicated monitoring services like UptimeRobot check every minute from multiple locations and alert you when downtime occurs.
What does it mean if DNS fails but HTTP succeeds?
This is unusual and indicates a caching issue — your tool may have a cached DNS response while the DNS lookup itself is failing. Clear DNS cache and retest.
How is this different from the Uptime Checker?
The Uptime Checker (/website-uptime-checker) is a simple HTTP status check. This tool runs 4 independent checks (DNS, HTTPS, HTTP, timing) and shows exactly which layer is failing.
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