In the May 2011 survey we received responses from 324,697,205 sites.

Apache exhibited by far the largest growth this month, gaining 12.5M hostnames and over 1.5 percentage points of market share. SoftLayer saw the largest increase, gaining 3.0M hostnames, while Earthlink took a big drop, losing 1.3M.

Microsoft only gained 0.8M hostnames this month, losing them half a percentage point of market share. Rackspace and GoDaddy both showed notable growth, 260k and 280k respectively, but Intergenia AG suffered a fairly big loss of 1.1M hostnames at server4you.net in the US.

nginx and lighttpd both saw small gains of 381k and 21k respectively, while Google gained a much larger 1.5M hostnames.

The Tōhoku Earthquake has not caused any significant drops in the number of sites seen by the survey, though Japan's growth this month of 231k hostnames was about two thirds of what was seen in March (345k) and April (389k).

In Libya, where most of the country's internet access was cut off in early March, hostnames have dropped by about 95% from 917 to just 42. The recent mass protests and political turmoil experienced by other North African and Middle Eastern countries, such as Tunisia, Egypt and Syria, has not yet resulted in any noticeable changes to the countries' hostname numbers.

In the April 2011 survey we received responses from 312,693,296 sites, a growth of almost 14.7M hostnames. This is the tenth consecutive month of growth seen by the survey.

As in recent months, Apache contributed most to the increase, gaining 11.4M hostnames. Especially large increases were seen at AmeriNOC, SoftLayer and ServerInt, which saw gains of 3.7M, 2.5M, and 1.2M hostnames respectively. Large increases were also seen at several hosting companies, including Amazon, China Telecom and BurstNET.

Microsoft saw an overall increase of 1.2M hostnames, with the largest growth seen at Go Daddy. Microsoft's largest loss was due to the continuing movement of Windows Live Spaces to WordPress.com.

This month saw nginx gain 651k hostnames overall, despite losses at ServePath, China Telecom and Amazon. The largest increase was seen at Hetzner Online AG which saw an additional 349k sites.

The Tōhoku Earthquake did not cause a drop in the number of sites seen by the Web Server Survey this month, as the data collection completed before the earthquake struck.

In the March 2011 survey we received responses from 298,002,705 sites, a growth of just over 13M hostnames on last month's survey; a continuation of the steady growth which has been seen since July last year.

Apache was the biggest contributor to this month's growth, with an increase of 8.5M hostnames. This increase comes despite large losses of 2.23M at skyrock.net due to their servers no longer reporting a server banner. Most of the increase is once again due to AmeriNOC and Softlayer, with gains of 5.5M and 1.2M hostnames respectively. Large increases were also seen at both Leaseweb and Hetzner Online AG.

nginx gained 1.2M hostnames this month due to increases at a number of hosting companies, the largest of which was 289k at Hetzner Online AG.

Small gains were seen by both Microsoft and Google, with increases of 560k and 205k hostnames respectively. Microsoft's increase came primarily from Go Daddy, and an increase of 296k hostnames hosted by Microsoft which made up for a drop seen there last month. Despite the gain in hostnames, Microsoft experienced a 0.7 percentage point loss in market share, while Google's share was relatively unchanged.

The only web server vendor to see a loss in the number of hostnames this month was lighttpd. It experienced a drop of 157k hostnames which was shared by multiple hosting companies.

In the February 2011 survey we received responses from 284,842,077 sites.

Apache saw the largest increase in terms of both market share and absolute growth this month, with 9.6M new hostnames equating to a 1 percentage point increase in market share. This continues the general upward trend seen for Apache since January last year. The most significant increase occurred in the United States, where 7M new Apache hostnames were recorded. Once again, significant contributions to Apache's increase were seen at AmeriNOC (4.6M) and Softlayer Inc (1.3M). Apache also made a net gain of 817k hostnames in the Netherlands as the result of a 1.3M increase at Axoft Group.

nginx and lighttpd also made gains this month, although lighttpd's market share remained static as a result of the increases detected for the other major web server vendors.

Microsoft and Google both lost hostnames and market share this month. Microsoft's most significant loss came in Germany, with a 239k drop. This came as a result of 237k fewer hostnames being recorded at Kabel Deutschland.

In the January 2011 survey we received responses from 273,301,445 sites.

nginx once again saw the largest increase in market share amongst the top web servers, gaining 0.88 percentage points or 3.59M hostnames. nginx now controls 7.50% of hostnames in the survey, though only 6.12% within the top 1 million sites. 2.4M of the additional nginx hostnames are hosted by Ecatel, which appears to have migrated from Apache to nginx this month. nginx's growth in active sites is more modest, adding 429k active sites, leaving nginx with a 8.23% share.

Lighttpd was the only other web server to increase its share of hostnames this month, increasing by 558k hostnames, 531k of which are hosted by Secure Hosting Limited.

Apache remains the dominant force, commanding a 59.13% share and an increase of 10.1M hostnames. The majority of the Apache growth was in the United States and Germany, together adding 9.9M hostnames. The growth in the United States is concentrated in AmeriNOC and Softlayer, together accounting for 7.34M hostnames. Germany's growth, on the other hand, is concentrated at a single hosting company, United Internet AG, adding domain holding pages for fhe3rz.net.

Microsoft made modest gains this month, adding 669k hostnames despite losing 1.2 percentage points in market share.