Website reachability checker
Test whether your browser can complete a network request to a website. This is deliberately not labelled a full uptime or HTTP-status checker because normal cross-origin browser security hides those details.
No request sent yet.
—
What the result means
A successful opaque request means the browser reached an endpoint well enough to complete the fetch operation. It does not reveal whether the remote response was HTTP 200, 404, 500 or another status. A failed check can also be caused by local network policy, browser blocking, DNS trouble or timeout.
A practical way to use this check
If a site appears unavailable in your normal tab, run the reachability check with the full HTTPS URL. A successful result suggests that a basic browser request can reach the destination from your current connection, so the visible problem may be page rendering, authentication, JavaScript, an application error or a response status this tool cannot inspect. A failed result is a signal to check DNS, connectivity and the exact URL rather than proof that the remote server is globally offline.
For example, if https://example.com fails here but its DNS records resolve normally, try the same site from another network or device. If both networks fail, an uptime monitor or server-side diagnostic can provide stronger evidence. If only one network fails, local DNS filtering, firewall rules, captive portals or browser policy may be involved.
Why NexusNova does not show a fake HTTP status or SSL expiry
A static browser page cannot generally inspect cross-origin response status, headers or the server’s TLS certificate unless the remote server explicitly allows access. Certificate expiry also is not exposed through normal browser JavaScript. NexusNova therefore does not invent those values; a trustworthy global status or SSL-expiry service would require a server-side checker or a separately licensed API.
What this tool cannot prove
This check is not a global uptime monitor, latency benchmark, certificate validator, malware scanner or service-level availability test. Results describe what this browser could attempt from this device at this moment. For production incidents, confirm with hosting logs, a server-side monitor and the site's DNS/TLS configuration.
Related reachability tools
Interpret a browser reachability check correctly
A browser reachability check tests whether a request from the browser can get a response through the network path available to it. It is useful for a quick first look at a public URL, but it is not equivalent to a server-side uptime monitor. Browsers enforce cross-origin security rules, and some sites intentionally block requests from other origins. A blocked browser request can therefore reflect a policy boundary rather than a server outage.
A sensible troubleshooting sequence
- Enter the public website address and check that the spelling and protocol are correct.
- Try opening the same address directly in a fresh browser tab.
- If it fails, compare another network or device only when doing so is safe and permitted.
- Check the site's official status page or server-side logs if you own or administer the site.
For example, a public API that rejects cross-origin requests may still be reachable from a server or its own website. Conversely, a page that opens in your browser may still have a broken checkout, login API, image service or background job. Use this result as one signal among several rather than as an all-purpose uptime verdict.
What this tool cannot prove
Client-side browser rules often prevent a page from reading the real HTTP status or TLS certificate details of a cross-origin destination. The checker therefore does not fabricate a detailed status code, certificate expiry or security rating it cannot observe. It also does not test every region, route, port or authenticated feature. A reliable uptime programme needs external probes, server logs and alerting configured for the service's actual requirements.
Reachability questions
Why can a site open directly but fail this check?
The target may block cross-origin requests or return headers that prevent browser JavaScript from reading the response.
Does a successful result mean every visitor can use the site?
No. DNS, network routes, authentication, server load and regional access can differ for other visitors.