We report a site's operating system, web server, and netblock owner together with, if available, a graphical view of the time since last reboot for each of the computers serving the site. Further information about what we measure and how we measure it is and other factors affecting the monitoring process are available here.

The graphs for each site display both the actual times since last reboot (as an X) and a moving average of uptime over time as a solid green area graph. The colour of the X changes in the event of the site switching operating system. A history of the operating system, web server and hosting location is also provided so it is possible to correlate these changes with the uptime of the site. When we are unable to get a valid uptime measurement for a site, a gap will appear in the plots of the raw data points.

Queries are made on a daily basis, so the crosses on single server site will appear as a diagonal line moving forward through time until the next reboot. Sites using multiple front end servers with some form of load balancer will show parallel diagonal lines.

Daily reports are generated showing the sites and hosting locations with the longest uptimes.

Example Site 1 - www.demon.net

Uptime for www.demon.net
Note: Uptime - the time since last reboot is explained in the FAQ Generated on 7-May-2009 Explanation:The chart shows the time since May 2001 when we first started monitoring www.demon.net through to May 2009. Each vertical line on the X axis represents several months. Each small 'x' on the chart represents a reading on a particular day. In the first months we can see several blue lines representing the servers servicing the site. Over the years we can see the updates to Solaris being applied. The current versions of this graph can be seen by querying the site.