Is this website down?
Check from 28 locations.
Instantly verify if a website is reachable from 28 servers across 16 countries. See HTTP status codes, response times, SSL certificate status, and redirect chains — all in seconds, no account required.
Check response status, timing, and availability of any URL from 28 servers worldwide.
Note: All checks are public. To keep your checks private, create a free account.
Global Network Diagnostics
Run a check to see your service from around the world.
- Tested from 28 monitoring locations worldwide
- Results in seconds, not minutes
- Shareable result links for your team
- No account or signup required
What is an HTTP Check?
An HTTP check is a network request sent to a web server to verify that a URL is reachable, responding correctly, and returning the expected content. When you run an HTTP check, the monitoring agent connects to your target URL, records the HTTP status code, measures the total response time, inspects SSL certificate validity, and follows any redirect chains — giving you a complete picture of how your website behaves from the outside.
Unlike a simple ping, which only confirms that a server is reachable at the network level, an HTTP check validates that the entire web stack is functioning: DNS resolution, TCP connection, TLS handshake, application response, and content delivery. A server can be "up" at the network layer while returning HTTP 503 errors or serving corrupted pages — an HTTP check catches these issues that a ping would miss entirely.
Emercom runs HTTP checks from 28 monitoring servers simultaneously, spanning 16 countries across 5 continents. This means you see not just whether your site is up, but where it is up — a critical distinction when serving a global audience through CDNs, load balancers, or multi-region infrastructure.
Understanding HTTP Status Codes
Every HTTP response includes a three-digit status code that tells you what happened with your request. Knowing what these codes mean helps you diagnose website issues quickly and accurately.
| Code | Name | Meaning |
|---|---|---|
| 200 | OK | The request succeeded. The server returned the requested resource. |
| 301 | Moved Permanently | The resource has permanently moved to a new URL. Browsers and search engines update their records. |
| 302 | Found | Temporary redirect. The resource is temporarily at a different URL; the original URL should be used in future requests. |
| 403 | Forbidden | Access denied. The server understood the request but refuses to authorize it — often due to IP blocking, firewall rules, or missing permissions. |
| 404 | Not Found | The resource does not exist at this URL. The page may have been deleted or the URL may be incorrect. |
| 500 | Internal Server Error | A generic server-side error. The server encountered an unexpected condition that prevented it from fulfilling the request. |
| 502 | Bad Gateway | The server received an invalid response from an upstream server. Common when a reverse proxy (nginx, Caddy) cannot reach the backend application. |
| 503 | Service Unavailable | The server is temporarily unable to handle the request — usually due to overload, maintenance mode, or a crashed application process. |
Why Check From Multiple Locations?
A website can appear fully operational from one location while being completely unreachable from another. This happens more often than most website owners realize, and single-location checks will miss these regional failures entirely.
Several factors cause location-specific outages. CDN edge nodes can fail or become misconfigured for specific regions, leaving users in those areas hitting errors while users elsewhere are unaffected. DNS propagation problems mean that after a zone change, some resolvers around the world will cache old records for hours — your new server is reachable from some locations but not others. ISP-level routing problems and BGP route announcements can black-hole traffic from entire regions. Geo-blocking rules implemented incorrectly in firewalls or DDoS protection systems may block legitimate traffic from specific countries.
By running HTTP checks from all 28 Emercom locations simultaneously, you immediately see which regions are experiencing problems and which are not. A result showing "up from 20 locations, down from 2" points directly at a regional issue — whether that is a CDN edge failure in Asia-Pacific, a DNS propagation lag in Europe, or a geo-firewall misconfiguration blocking requests from specific IP ranges. This kind of insight is impossible to get from a single-location check.
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