December 2017 Web Server Survey

In the December 2017 survey we received responses from 1,734,290,608 sites across 212,870,632 unique domain names and 7,014,428 web-facing computers. This reflects a gain of 5.34 million domains and 121,000 computers.

Web Server Developers - Market Share of Domains

The number of hostnames in use on the web has been a headline metric since the inception of the Web Server Survey, but it has been subjected to quite large fluctuations in recent years. Netcraft has therefore introduced the number of unique domains as an additional metric that provides a more stable view of the web.

The domains metric is not influenced by wildcarded domains or other large numbers of sites that can be hosted under a single domain name with minimal effort; but unlike the active sites metric, the domains metric still takes account of sites that are still under construction, or running hosting company or domain registrar holding pages.

Web server market share for domains

The noticeable spike in Apache-powered domains in May 2013 was caused by the largest hosting company of the time, GoDaddy, switching a large number of its domains from Microsoft IIS to Apache Traffic Server (ATS) . GoDaddy switched back to using IIS 7.5 a few months later.

Today, Apache still has the largest market share by number of domains, with 81.4 million giving it a market share of 38.2%. It also saw the largest gain this month, increasing its total by 1.53 million. This growth was closely followed by nginx, with a gain of 1.09 million domains increasing its total to 47.5 million. While Microsoft leads by overall number of hostnames, it lags in 3rd position when considering the number of unique domains those sites run on, with a total of 22.8 million.

Web-facing Computers

The number of web-facing computers provides an alternative view that corresponds more closely to the install base of each server vendor.

With 1.63 million web-facing computers, nginx is already 97,800 computers ahead of Microsoft since it took second place in October, but Apache remains much further ahead with a total of 2.98 million. Apache experienced the largest gain of 58,000 computers this month, closely followed by nginx with 49,000, and with Microsoft trailing with an increase of just 22,000.

Web server market share for computers

Web Server Updates

Microsoft's Internet Information Services platform has benefitted from a few improvements since the publication of last month's survey. The newest version of the IIS Administration API (2.2.0) introduced new endpoints that make it easy to monitor the health of a web server, as well as the individual websites and application pools running on it. There is also a new configuration endpoint for the files API, which allows the API's root folders to be configured – this means administrators no longer have to edit a file to configure which sections of the file system can be accessed via the API.

Version 1.0 of the IIS CORS Module, which works on IIS 7.5 or later, was also released in November. This enables support for the Cross-Origin Resource Sharing protocol, which lets webpages make use of resources that are hosted on other websites, such as web fonts and AJAX endpoints. If a website hosts these resources without setting a suitable CORS policy, the default same-origin policy enforced by all browsers would prevent other websites from accessing them.

The latest version of the open source LiteSpeed HTTP server, OpenLiteSpeed 1.4.28 (stable), was released on 8 November. This release adds multithreading APIs for LSIAPI – the API that allows it to support third-party modules. Although there are only 12,400 web-facing computers running LiteSpeed, these computers host 2.42 million domains. It is not clear how many of these computers are already running LiteSpeed 1.4.28, as this server does not expose version information in its headers.

lighttpd 1.4.48 was subsequently released on 11 November. This adds a new mod_authn_sasl module, which provides Simple Authentication and Security Layer (SASL) authentication similar to Apache's libapache2-mod-authn-sasl module. With 20,800 web-facing computers running lighttpd, it has a greater install base than LiteSpeed, but its market share of domains is noticeably smaller with a count of 565,000.

nginx 1.13.7 was released on 21 November, although this addresses several bugs rather than introducing any new features. There are, however, several new features in the latest version of its commercially supported product, NGINX Plus Release 14, which was announced on 12 December. This release features several improvements, including an updated live monitoring dashboard and JSON support in its nginScript scripting language; and there is also a technology preview of its extended clustering support, which lets NGINX Plus instances in a cluster share state information.

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November 2017 Web Server Survey

In the November 2017 survey we received responses from 1,819,412,110 sites and 6,893,323 web-facing computers, reflecting a gain of 4.17M sites and 6,961 computers.

This month’s web server survey saw Microsoft’s market share amongst all sites fall by 12.64 percentage points due to a loss of 228M sites. Despite this, Microsoft still retains its place with the largest market share by this metric of 36.80%, with Apache trailing at 24.38%. The majority of the loss occurred at just one hosting provider where over 190M Microsoft sites were lost.

This change isn’t reflected in the active sites metric which only saw minor changes amongst the main web server vendors. Microsoft lost only 0.03 percentage points of its market share with a drop of 261k active sites. Apache leads in the active sites metric by a considerable margin, increasing its share slightly this month to 44.55%.

Amongst the top million busiest sites Microsoft experienced a small increase in market share, pausing its general decline in this market. nginx experienced the largest growth with an increase of 2,133 of the top million sites.

nginx also saw the largest increase in number of web-facing computers, gaining 25k and pulling 1 percentage point of market share clear of Microsoft, which it overtook last month. Apache also experienced a gain in computers, albeit smaller at just 7k. It remains considerably ahead with a 42.38% market share.

New gTLDs Seen for the First Time

This month the controversial new .search gTLD being run by Google’s Charleston Road Registry subsidiary was found for the first time, with responding to the survey. Google hopes it will be able to run .search as a dotless domain which will automatically redirect users to their search engine of choice. This proposal has been criticised for going against ICANN’s own rules, which prohibits this functionality due to the potential for conflicts with existing names on internal networks. This feature could also cause confusion for users who have come to expect that typing words into their address bar will perform a search query for that term.

It is currently uncertain whether or not Google will be allowed to run the .search TLD as a dotless domain, however with the launch of the first site on this TLD this month Google is one step closer to the provision of this service.

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October 2017 Web Server Survey

In the October 2017 survey we received responses from 1,815,237,491 sites and 6,886,362 web-facing computers, reflecting a gain of 10.2 million sites and 88,300 computers.

Web-facing computers: nginx takes second place from Microsoft

nginx made the largest gains in websites, active sites, and web-facing computers this month, as well as increasing its presence among the top million sites. Most notably, the additional 42,100 web-facing computers it gained has taken its total up to 1.55 million computers, putting it ahead of Microsoft for the first time.

Overtaking Microsoft means that nginx is now the second largest server vendor in terms of web-facing computers. With its remarkably consistent growth, nginx is likely to retain this newfound position for some time – not least because Microsoft's web-facing computer share has been on a general decline since 2010.

In the other metrics, nginx gained 18.4 million sites, 941,000 active sites, and slightly increased its share of the top million sites to 29.43%. It stays ranked in 2nd place within the top million sites and active sites, but 3rd in all sites.

While Microsoft's loss of 3,470 web-facing computers helped propel nginx into second place, it made more significant losses in other metrics – it lost 30.1 million sites this month, although this corresponds to a loss of only 85,500 active sites.

New releases

Apache 2.4.29 was released on 23 October. This security, feature and bug fix release represents the latest version of the current 2.4.x branch. As usual, it is recommended over all previous releases, but it is difficult to track how many website administrators take heed of this advice.

For instance, many Apache servers do not reveal via their Server headers or error pages which version has been installed, while others may have been updated with backported patches that do not affect the displayed version number. Consequently, a large number of Apache servers claim to be running older versions than they really are. Only 12.6% of the 341 million sites running Apache claim to be running a 2.4.x release, whereas the true proportion is likely to be much higher, given that almost two-thirds of Apache-using sites do not disclose any version number.

Apache continues to lead the market in terms of active sites and web-facing computers, where it has market shares of 44.5% and 42.3%. It also has the largest presence among the top million sites, with 386,000 of these using Apache.

Another new release this month was LiteSpeed Web Server 5.2.2 (stable), which was released on 17 October. This addresses a couple of bug fixes and improves compatibility with the latest version of the popular cPanel web-based control panel.

As well as its commercially supported LiteSpeed Web Server, LiteSpeed Technologies Inc also provides OpenLiteSpeed, which is freely available under the GPL version 3 licence. LiteSpeed is currently the 7th largest vendor in terms of hostnames and active sites: Nearly 11.5 million sites in the survey are powered by LiteSpeed, and 2.7 million (24%) of these are deemed to be active sites.

One of LiteSpeed's most prominent gains was made in November last year, when a large number of hostnames under the .science top-level domain switched to it from Taobao's Tengine web server. This caused LiteSpeed's market share of sites to leap from 0.39% to 3.29%, although it has since settled back down to 0.63%. Nonetheless, this is still noticeably larger than its share of web-facing computers, which currently stands at 0.17%.

nginx 1.13.6 (mainline) and nginx 1.12.2 (stable) were also released in October. Both releases consist solely of bug fixes.


Alongside the new releases of nginx, the homepage unusually announced the release of a different product this month: NGINX Unit 0.2 Beta.

NGINX Unit is a lightweight dynamic web application server designed to run applications written in Python, PHP, Go, JavaScript, Java and Ruby, although the current beta release does not support all of these languages, nor does it support TLS, routing or proxying yet.

Precompiled binaries are available for CentOS 7 and Ubuntu 16.04, but as it is a beta release, it is not recommended for use in a production environment. Consequently, it is unlikely to have much of a presence on the web in the near future; also, for performance reasons, it is likely that NGINX Unit would be installed behind a regular nginx web server acting as a reverse proxy.

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September 2017 Web Server Survey

In the September 2017 survey we received responses from 1,805,060,730 sites and 6,798,101 web-facing computers, reflecting a gain of 4.49 million sites and 84,800 computers. This is the largest number of web-facing computers in history, and cloud computing has helped fuel this growth considerably. The top three cloud hosting providers—Amazon, Alibaba and DigitalOcean—now account for nearly 22% of all web-facing computers, as well as more than a third of this month's net computer growth.

nginx has dominated this month's computer growth once again, with an additional 49,900 computers taking its market share up to 22.2%. This puts it within 20,000 computers of Microsoft's 22.5% share, giving nginx a realistic chance of taking second place by next month. Meanwhile, Apache remains far ahead in the lead with 2.88 million web-facing computers giving it a 42.3% share of the market.

While more than half of the websites in the survey are using Microsoft web server software, relatively few of these are active sites. Discounting link farms, domain holding pages and other automatically generated content, Microsoft accounts for only 7.3% of all active sites, while Apache leads with 44.9%, and nginx follows with 20.7%. Microsoft's active sites share has never exceeded Apache's, and ever since it peaked at 38% in early 2009, it has experienced a general decline.

Microsoft's presence within the top million websites has also been steadily declining – in 2008, it had a 20% share, but this has since dwindled to less than 10%. Today, 9.73% of the top million sites use Microsoft web server software (mostly IIS – Internet Information Services), while Apache leads with 38.9%. However, Apache has also been experiencing a general decline since 2011, while nginx has continued to muscle its way in. A further 1,299 nginx-powered sites made their way into the top million this month, lifting nginx's share to 29.4%.

Web-facing operating systems

Apache has been the most commonly installed web server for many years, but which underlying operating systems are used by the world's web facing computers?

By far the most commonly used operating system is Linux, which runs on more than two-thirds of all web-facing computers. This month alone, the number of Linux computers increased by more than 91,000; and again, this strong growth can largely be attributed to cloud hosting providers, where Linux-based instances are typically the cheapest and most commonly available.

It is difficult to distinguish different Linux distributions by examining their TCP/IP characteristics, but inferences can be made from other clues, such as Server headers. The Linux distribution can be positively identified in around 30% of cases, and of these 1.39 million Linux computers, just over half are running Ubuntu Linux, nearly a quarter are running CentOS, and around fifth are running Debian Linux.

Microsoft is next up, with 26.8% of all web-facing computers running various versions of Windows Server. Interestingly, this is higher than Microsoft's web server share (22.5%), and can be explained by around 20% of Windows computers being used to run other web server software – such as Apache and nginx – rather than its native Microsoft IIS web server. Conversely, around 51,000 Linux computers expose Microsoft IIS web servers to the internet – in these cases, the Linux frontends are typically acting as load balancers or reverse proxies to backend Windows computers running IIS.

Windows Server 2008 is the most commonly used version of the Windows Server family of operating systems – it currently runs on 971,000 web-facing computers, and this is followed by Windows Server 2012, which is installed on 505,000.

Windows and Linux are essentially the "big two" when it comes to web-facing operating systems. FreeBSD was once notorious for its reliability and impressively large uptimes when used as a server platform; indeed, Netcraft's infrastructure made extensive use of it in the past, but it is now a relatively niche operating system compared with its heyday. Today it is used by only 1.3% of web-facing computers, more than half of which are being used to run the Apache web server.

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August 2017 Web Server Survey

In the August 2017 survey we received responses from 1,800,566,882 sites and 6,713,340 web-facing computers. This represents a gain of 32.6 million sites (+1.84%) and 120,000 computers (+1.82%).

Continuing its consistently strong performance, nginx once more gained the most web-facing computers, increasing its total by 50,800 (+3.6%). Second-place Microsoft also gained computers (+5,000, +0.3%), albeit much more modestly. As a result, its market share dipped 0.34 percentage points. Apache gained 32,200 web-facing computers (+1.1%), but also saw its share fall, dropping 0.28 percentage points to 42.5%.

The gap in the market share of web-facing computers between nginx and Microsoft has narrowed to 1.13 percentage points. If current trends continue, the number 2 position should be well within nginx's reach before the end of 2017. However, with an almost 20-percentage-point lead over both nginx and Microsoft, market-leader Apache is unlikely to be dethroned anytime soon.

nginx also continues to gain market share amongst the million busiest sites, with 2,200 more top sites seen using the web server this month. Apache's dominant position continues to gradually erode, dropping by 1,700 sites in August. nginx is still a distant second, but for the first time is fewer than 100,000 sites behind. Third-place Microsoft also continues a gradual decline, and after losing a further 980 sites from the top million this month its market share now stands at 9.80%.

Turbulent times for .xyz

.xyz experienced the largest growth among all TLDs this month, gaining websites on over 761k unique domains (+22%). This brought the 7th largest TLD up to over 4 million domains hosting web content. However, it is unlikely to maintain this position for long, with the .xyz zone file losing over 44% of its registered domains shortly after the August survey ran.

The .xyz top-level domain was launched to the public in June 2014 and had reached almost 100,000 domains within the first 10 days after a Network Solutions promotion which gave free matching .xyz domains with each .com domain purchased. This was done on an opt-out basis, with the domains only being free for the first year, causing some confusion the following year when each domain became due for renewal at a cost of $38. ran another promotion in June 2016 to celebrate its 2 year anniversary. For 2 days .xyz offered domains for just 2¢ (including the ICANN fee), leading to the TLD more than doubling in size after nearly 2.7 million domains were registered. Unsurprisingly, just over one year on, this has led to a dramatic drop in the number of registered .xyz domains; fewer than 1% of the domains created during the event are still registered.

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July 2017 Web Server Survey

In the July 2017 survey we received responses from 1,767,964,429 sites and 6,593,508 web-facing computers. This represents a small gain of 1.0 million sites (+0.06%) and 71,000 computers (+1.1%).

nginx growth unfaltering

A further 52,000 (+3.84%) web-facing computers were found running nginx this month, which has brought its market share up to 21.4%. It is currently the third-largest server vendor in terms of web-facing computers, but it is now only 122,000 computers away from Microsoft. With no reason to suspect that its consistently strong growth could falter soon, it is likely to take second place from Microsoft later this year.

Originally developed to solve the C10k problem, nginx has seen phenomenal growth in web-facing computers.

Originally developed to solve the C10k problem, nginx has seen phenomenal growth in web-facing computers.

nginx's market share growth was also assisted by Microsoft's loss of 6,400 computers, while Apache's gain of 7,500 computers was not enough to stop its own share falling by 0.35 percentage points. Apache is still far in the lead, though – more than 2.8 million web-facing computers currently run various versions and derivatives of the Apache httpd, giving it a 42.8% share of all web-facing computers.

Microsoft now serves more than half of all sites

In terms of hostnames, Microsoft gained 78 million sites, while Apache lost 56 million. This large shift has given Microsoft more than half of the market for the first time ever – 53.2% of all hostnames – with nearly three times as many sites as Apache has.

This marks a complete role reversal from four years ago, when Apache held 52% of the market while Microsoft had just 19.7%. That was the last time more than half of the world's websites used Apache. However, the hostnames metric is volatile, being susceptible to large swathes of automatically generated sites served from relatively few computers. These types of site are not counted in Netcraft's active sites survey, which paints a very different picture: Apache has more than six times as many active sites as Microsoft, and more than twice as many as nginx.

Notably, Apache has always held the largest share of the active sites market ever since the metric was included in our surveys in 2000. While Microsoft came within 10 percentage points of Apache's share on a few occasions last decade, it is now a long way off with only a 7.48% share, compared with Apache's share of 45.2%.

Apache 2.2 reaches end of life

Apache 2.4.27 was released on 11 July, along with Apache 2.2.34, which will be the final release in the 2.2.x legacy branch. Security patches for Apache 2.2.34 may be made available until December 2017, but no further maintenance patches or releases are anticipated.

To remain secure, sites still using Apache 2.2 will need to migrate to Apache 2.4 fairly swiftly. While it is difficult to tell exactly how many sites are running soon-to-be unsupported versions of Apache 2.2, at least 72 million sites claim to be using Apache 2.2 in their Server headers. The majority of these sites are hosted in the United States.

On the same day as the Apache releases, nginx 1.12.1 stable and nginx 1.13.3 mainline were released, with both including a simple fix for an integer overflow vulnerability in nginx's range filter module.

Not to be outdone, version 2.0.0 of Microsoft's IIS Administration API was also released in July, little more than two months after 1.1.0 hit general availability. The API is intended to make it easier to manage Microsoft IIS web servers, and the new version includes a range of "under the hood" improvements that make it easier to install and configure. The Microsoft IIS team also released a new version of URL Rewrite and made several improvements to its browser-based management portal at during June.

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