During September all of the sites monitored experienced some failed requests, with Energis, New York Internet, Express Technologies and
INetU the most reliable sites during the period.
Outages caused by hurricanes and floods were absent from the list, however Alabanza experienced a major outage due to an underground fire near its datacenter.
The dominant operating system was Windows, with six of the top most reliable sites running on a Microsoft operating system, evenly split between Windows Server 2003 and Windows 2000.
Netcraft measures and makes available the response times of fifty leading hosting providers' sites. The performance measurements are made at fifteen minute intervals from four separate points around the internet, and averages are calculated over the immediately preceding 24 hour period.
Fuller information on the measurement process and current measurements are available.