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Our HTTP Server status codes testing tool allows you to determine whether a website is offline or online. Every time your browser requests a website, status codes are returned. If something goes wrong, your browser displays a message such as "Something isn't right, along with error code e.g. 404".
As a webmaster or SEO, you should check the server status of your websites on a regular basis. FREE-Seo.org provides a free server status checker. Run a free test on a single or multiple URLs.