Website Uptime refers to the amount of time when server keep up running, which means website is accessible. It is generally listed as a percentage, like “99.9% uptime.” by most of the hosting providers. It is a great measure to find out how good a Web hosting service provider is at keeping their servers up and running. This tutorial lists some popular webservices you can use for monitoring your website’s uptime.
So these are some good services you can use to monitor your website or weblog’s uptime. If you also know you about any good web monitoring service then feel free to mention it in the following comments.