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Free uptime validator

Website availability checker

Check if a URL is reachable, capture redirects, and see latency without creating an account.

  • Instant HTTP/HTTPS check with status code and latency.
  • Redirect-aware: captures final URL and SSL errors.
  • Safe by default: ignores private networks and times out quickly.

We ignore private IPs and stop the request after a few seconds to keep checks safe.

Availability result

Waiting to check your site

Enter a URL to see status code, final URL, and response time.

What this checker validates

Reachability

HTTP/HTTPS with DNS resolution, redirects, and TLS validation.

Status code clarity

Detect 2xx/3xx/4xx/5xx responses and surface cURL errors if they occur.

Latency snapshot

Measure time to first byte and flag slow responses over a few seconds.

Move from one-off checks to full coverage

Status pages, health checks, and API monitoring in one place.

Turn this check into continuous monitoring with alerts and status pages.

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Status pages

Publish uptime, incidents, and maintenance windows for stakeholders.

Explore status pages

Health checks

Schedule global pings, track latency, and alert on slowdowns automatically.

View health checks

API monitoring

Watch JSON endpoints, auth flows, and SLAs with webhooks and alerts.

See pricing

Public availability snapshots

Example uptime signals from Centinela monitors to compare against your checks.

Demo data shown for SEO. For real-time monitoring, start a free Centinela trial.

Create a status page
Site Status Latency Last checked Type
Operational
188 ms
1 min ago
Production
Operational
245 ms
3 min ago
Public
Warning
620 ms
5 min ago
Sandbox
Operational
302 ms
8 min ago
Reference

Availability checker FAQ

It runs a lightweight HTTP/HTTPS request, follows up to three redirects, measures latency, and reports the status code so you know if a site is reachable.

Yes. The examples on this page are a snapshot. In Centinela you can add your own public or private URLs, create status pages, and share availability with stakeholders.

No. We intentionally block private IP ranges and localhost. For internal monitoring, add the URL inside Centinela where checks run from hardened workers.

Create a free Centinela trial. You can schedule checks, set alert policies, and publish public status pages with incident history.