Each of the top three hosting companies had only one failed request this month and they are therefore ranked by average connection time.

Top of the table this month is Datapipe, which offers a range of services including managed hosting, compliance, security and cloud computing. Datapipe is committed to customer service and offers a 100% network uptime guarantee.

The second most reliable hosting company in June was INetU, which offers dedicated managed hosting services from data centers with resilient networks, backup power and strong physical and network security. InetU also offers compliance and consultancy services to customers around the world.

Third this month was New York Internet. NYI offers colocation, dedicated servers and virtual hosting from data centers in New York. The company focuses on reliability and technical support that is responsive round the clock.

Half of the sites in the top ten in June were running Linux, four were running FreeBSD, and one was running Windows Server 2003.

Netcraft measures and makes available the response times of around forty leading hosting providers' sites. The performance measurements are made at fifteen minute intervals from separate points around the internet, and averages are calculated over the immediately preceding 24 hour period.

From a customer's point of view, the percentage of failed requests is more pertinent than outages on hosting companies' own sites, as this gives a pointer to reliability of routing, and this is why we choose to rank our table by fewest failed requests, rather than shortest periods of outage. In the event the number of failed requests are equal then sites are ranked by average connection times.

Information on the measurement process and current measurements is available.

Datapipe was the most reliable hosting company in May 2011 with only a single failed request from Netcraft's performance monitors this month. Datapipe provides a range of managed services and colocation from data centres in New Jersey, California, London, Shanghai and Hong Kong. In May, Datapipe announced it had secured $176 million dollars in equity and finance to accelerate its expansion.

The second most reliable hosting company in May was www.serverbeach.com, which failed to respond to only two requests. ServerBeach offer cloud services, dedicated servers, managed hosting and colocation. As a child company of PEER 1 hosting, ServerBeach uses its parent company's IT infrastructure and network backbone.

Third this month was iWeb Technologies, a Canadian hosting company based in Montreal. iWeb Technologies provide web hosting, dedicated servers, managed hosting and colocation to customers from around the world.

Netcraft measures and makes available the response times of around forty leading hosting providers' sites. The performance measurements are made at fifteen minute intervals from separate points around the internet, and averages are calculated over the immediately preceding 24 hour period.

From a customer's point of view, the percentage of failed requests is more pertinent than outages on hosting companies' own sites, as this gives a pointer to reliability of routing, and this is why we choose to rank our table by fewest failed requests, rather than shortest periods of outage. In the event the number of failed requests are equal then sites are ranked by average connection times.

Information on the measurement process and current measurements is available.

Heading the table for April with only two failed requests from any of the performance monitors during the month was Rackspace. Rackspace provides managed and cloud hosting from nine datacentres in the U.S., the U.K. and China. Rackspace frequently features in Netcraft's top ten most reliable hosting companies, having appeared five times in the last year.

Second most reliable this month was Qube, a London-based hosting company which also has datacentres in New York and Zurich. Qube provide managed hosting, managed colocation and cloud hosting for a wide variety of customers, particularly in the areas of finance and new media. Although Qube has previously appeared in the top ten, this is the first time the hosting company has made it to the top three.

The third most reliable hosting company in April was Netcetera. Netcetera experienced the same number of failed requests as Qube, but had a longer average connection time. Netcetera provides a wide range of colocation, hosting and cloud services to customers throughout the world.

Five of the top ten sites this month were running on Linux, two were running on FreeBSD, and one on Windows. Rackspace's site, which performed best this month, is hosted on F5 Big-IP.

Netcraft measures and makes available the response times of around forty leading hosting providers' sites. The performance measurements are made at fifteen minute intervals from separate points around the internet, and averages are calculated over the immediately preceding 24 hour period.

From a customer's point of view, the percentage of failed requests is more pertinent than outages on hosting companies' own sites, as this gives a pointer to reliability of routing, and this is why we choose to rank our table by fewest failed requests, rather than shortest periods of outage. In the event the number of failed requests are equal then sites are ranked by average connection times.

Information on the measurement process and current measurements is available.

The most reliable hosting company in March was dinahosting, which has been offering hosting services since 2002. The company's data centre is spread across 25 buildings located in Madrid, Spain, which are physically protected by sluice gates and biometric access controls. Besides Spanish, dinahosting also provides support for customers who speak Catalan, Galician, English, and Portuguese. To increase performance from other countries, dinahosting also has additional DNS servers in London and Dallas.

dinahosting is currently offering 50% off its RealCloud cloud hosting service, which is managed by Xen hypervisor 4.0.0 running on Dell PowerEdge R410 servers. This platform supports auto-scaling to dynamically allocate additional resources when required, such as during traffic spikes. As with many other cloud hosting services, CPU-hours and bandwidth are charged for on a pay-as-you-go basis.

Virtual Internet took second place, with only eight failed requests throughout March. The UK-based company is scheduled to launch its flexible managed hosting and cloud hosting solutions in the USA from 1st May 2011. Virtual Intenet's cloud hosting services are based on VMWare, and include a 100% uptime guarantee, automatic crash recovery, 1 gigabit networking and 20 day try-before-you-buy offer. Other services offered by Virtual Internet include colocation, global content delivery and business email hosting.

Six of the most reliable hosting company sites in March were running on Linux, including each company within the top four. Of the remaining companies, two used FreeBSD and one used F5 BIG-IP.

Netcraft measures and makes available the response times of around forty leading hosting providers' sites. The performance measurements are made at fifteen minute intervals from separate points around the internet, and averages are calculated over the immediately preceding 24 hour period.

From a customer's point of view, the percentage of failed requests is more pertinent than outages on hosting companies' own sites, as this gives a pointer to reliability of routing, and this is why we choose to rank our table by fewest failed requests, rather than shortest periods of outage. In the event the number of failed requests are equal then sites are ranked by average connection times.

Information on the measurement process and current measurements is available.

This month's most reliable hosting company is Datapipe. Datapipe was ranked first last month, and has now been in the top ten for 11 of the last 12 months. Datapipe offers managed hosting and IT services from six data centers distributed across the globe and has recently started to offer managed cloud hosting through a product called the Datapipe Managed Cloud. This new service is backed by Amazon Web Services, and Datapipe say it's the "first Managed Services Provider of significant scale and size to offer Amazon Web Services to enterprise clients in a comprehensive, all-inclusive managed services program."

In second and third place this month are Swishmail, which offers managed email and web hosting, and New York Internet which offers various services, including dedicated servers, colocation and web hosting. Swishmail and New York Internet also frequently appear in Netcraft's top ten most reliable hosting company sites.

This month, the three most reliable hosting company sites are being served by FreeBSD. Of the remaining seven sites, six run Linux and one runs Windows Server 2003.

Netcraft measures and makes available the response times of around forty leading hosting providers' sites. The performance measurements are made at fifteen minute intervals from separate points around the internet, and averages are calculated over the immediately preceding 24 hour period.

From a customer's point of view, the percentage of failed requests is more pertinent than outages on hosting companies' own sites, as this gives a pointer to reliability of routing, and this is why we choose to rank our table by fewest failed requests, rather than shortest periods of outage. In the event the number of failed requests are equal then sites are ranked by average connection times.

Information on the measurement process and current measurements is available.