Website Uptime Checker – Check if Website Is Up or Down Free
Check if any website is currently up or down. See HTTP status code and response time instantly. Free online uptime checker.
What is Website Uptime Checker – Is This Website Down or Up??
A website uptime checker sends an HTTP request to any URL and reports whether the server responds successfully — showing the HTTP status code, response time, and whether the site is accessible. It is a quick first-response tool for checking if a site is down globally or just unreachable from your location.
How to Use Website Uptime Checker – Is This Website Down or Up?
- 1Enter the URL of the website you want to check.
- 2Click Check Uptime to send an HTTP request.
- 3See the HTTP status code (200 = up, 5xx = server error, 0 = unreachable).
- 4Check the response time in milliseconds.
- 5If down, wait and re-check to confirm it's not a temporary issue.
Key Features
- ✓Instant HTTP status check
- ✓Response time in milliseconds
- ✓Pass/fail indicator
- ✓Checks from the server side (not just your browser)
- ✓No sign-up required
Benefits
- →Confirm if a site is down for everyone or just you
- →Monitor critical pages before and after deployments
- →Quickly verify uptime after DNS changes
- →First-step diagnosis for website availability issues
Why Use Irreva for Website Uptime Checker – Is This Website Down or Up??
Frequently Asked Questions
What does uptime mean for a website?
Uptime refers to the percentage of time a website is accessible and responding normally. A site is 'up' when it returns an HTTP success code (2xx) or redirect (3xx). A site is 'down' when it returns an error (5xx) or is unreachable.
How accurate is this uptime check?
This tool performs a single check from a public proxy server. It gives a snapshot of availability at that moment. For continuous uptime monitoring with alerts, use a dedicated service like UptimeRobot or Pingdom.
What HTTP status codes mean the site is up?
Status codes 200–399 indicate the site is functioning. 200 is a normal response, 301/302 are redirects (the final destination is up). Codes 400–599 indicate errors — 503 (Service Unavailable) is a common 'down' code.
Why might a live site show as down?
The public proxy may be blocked by the site's firewall or WAF. Some sites require specific User-Agent headers. The proxy itself may be temporarily overloaded. For sites known to be up, try the Website Speed Test tool instead.
What does a 200 status mean?
HTTP 200 means the server responded successfully — the site is up. 301/302 means a redirect (the site is up but redirecting). 4xx means a client error (likely misconfiguration). 5xx means a server error (site is having problems). 0 or timeout means the server didn't respond at all.
Is this different from the Website Availability Checker?
The Uptime Checker is a simple pass/fail HTTP status check. The Website Availability Checker (/website-availability-checker) performs a more thorough multi-signal check including DNS, HTTPS, response headers, and response time.
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