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OS/Linux Distributions using Apache

You are viewing an outdated report. The latest version of this report was published on May 1st, 2025

OS/Linux Distributions using Apache

September 1st, 2018

Report Description

The Apache server has in virtually any unbiased metric available (either from us or elsewhere) a majority market share in the web server market. Couple this with the fact that Apache will often provide hints as to the nature of the host OS it is running on, and one can view trends of linux distributions, how specialty OS' are performing in the server market and so on.

Methodology

The principal is simple: when issuing a request for a page to an Apache web server, the response received consists of HTTP

Response Headers

as well as the body of the web page being requested. For example, consider if we connect to a host on port 80 and request the root document. Our transaction might look something like this:

$ telnet 192.168.1.1 80 Trying 192.168.1.1... Connected to 192.168.1.1. Escape character is '^]'. GET / HTTP/1.0 HTTP/1.1 200 OK Date: Thu, 14 Feb 2008 16:24:24 GMT Server: Apache/2.2.3 (Debian) DAV/2 PHP/4.4.4-8+etch4 mod_perl/2.0.2 Perl/v5.8.8 Last-Modified: Wed, 10 Oct 2007 14:01:07 GMT ETag: "62c786-15eb-43c23eac2cec0" Accept-Ranges: bytes Content-Length: 5611 MS-Author-Via: DAV Connection: close Content-Type: text/html; charset=UTF-8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"> <html> ...<snip> </html>

The above response headers show the Server: header indicating the version of Apache, various add-on modules, as well as the fact that this platform is running the Debian linux distribution.

Reporting by Hostname (Sample size: 4,929,389 web sites)

It should be noted that not all web servers will report back the Host OS signature. In an Apache configuration file, the

ServerTokens

directive can be used to to disable the disclosure of this information. Only configurations that do not specify the

ServerTokens

directive, or set it to

Full

may reveal sufficient information to allow disclosure of the OS and distribution hosting the server.

In this month's survey, 26,820,235 Apache servers were detected, but only 4,929,389 (18.38%) revealed sufficient information to detect the host OS. The remainder of the survey by host information shown below is based on this subset of Apache servers that revealed the host OS.

OS/Distribution August 2018
Hostname Count August 2018
% July 2018
Hostname Count July 2018
% Growth
% CentOS 1,540,292 31.25 1,542,654 30.97 0.89 Debian 1,476,462 29.95 1,504,918 30.21 -0.87 Ubuntu 1,187,671 24.09 1,208,755 24.27 -0.72 Red Hat 225,436 4.57 229,767 4.61 -0.86 Windows 190,281 3.86 182,759 3.67 5.20 FreeBSD 145,831 2.96 149,542 3.00 -1.47 Fedora 74,740 1.52 72,256 1.45 4.52 SuSE 62,275 1.26 63,073 1.27 -0.24 Scientific Linux 8,613 0.17 8,638 0.17 0.75 Oracle 5,103 0.10 5,388 0.11 -4.30 Turbolinux 3,161 0.06 3,245 0.07 -1.57 Gentoo 3,053 0.06 3,112 0.06 -0.87 Darwin 1,390 0.03 1,440 0.03 -2.47 Mandriva 1,188 0.02 1,250 0.03 -3.97 Mac OS X 983 0.02 963 0.02 3.14 Sun Cobalt 714 0.01 733 0.01 -1.58 APMServ 596 0.01 619 0.01 -2.71 Netware 288 0.01 298 0.01 -2.35 Trustix 242 0.00 246 0.00 -0.60 IBM 180 0.00 185 0.00 -1.69 Asianux 173 0.00 182 0.00 -3.95 ASPLinux 160 0.00 160 0.00 1.04 OpenVMS 125 0.00 124 0.00 1.86 BlueQuartz 94 0.00 93 0.00 2.13 OpenPKG 76 0.00 76 0.00 1.04 OS/2 72 0.00 78 0.00 -6.73 ALT Linux 55 0.00 55 0.00 1.04 UnitedLinux 43 0.00 42 0.00 3.45 White Box 29 0.00 29 0.00 1.04 rPath 18 0.00 10 0.00 81.87 ClarkConnect 14 0.00 13 0.00 8.81 OpenNA 9 0.00 9 0.00 1.04 Lineox 5 0.00 5 0.00 1.04 RedFlag 3 0.00 3 0.00 1.04 Tao 3 0.00 3 0.00 1.04 Haansoft 3 0.00 3 0.00 1.04 PCLinuxOS 3 0.00 3 0.00 1.04 iSeries 2 0.00 2 0.00 1.04 Cygwin 2 0.00 2 0.00 1.04 Miracle 1 0.00 1 0.00 1.04 Reporting by Installation (Sample size: 649,805 IP Addresses)

The following graph and table are based on the same underlying data set as in the previous graphs and table, but with the distinction that we count unique IP addresses instead of unique hostnames, thus getting a more accurate representation of the number of actual web servers installed. (See

Web Survey by IP

for more details).

In this month's survey, 2,308,770 distinct IP Addresses hosted Apache servers, but only 649,805 (28.15%) revealed sufficient information to detect the host OS. The data below is based on this subset of servers that revealed the host OS.

OS/Distribution August 2018
IP Address Count August 2018
% July 2018
IP Address Count July 2018
% Growth
% Ubuntu 208,089 32.02 209,267 31.98 0.13 CentOS 172,146 26.49 173,410 26.50 -0.04 Debian 163,700 25.19 164,908 25.20 -0.05 Windows 42,268 6.50 41,821 6.39 1.77 Red Hat 22,651 3.49 23,130 3.54 -1.39 FreeBSD 17,225 2.65 17,512 2.68 -0.96 Fedora 9,933 1.53 10,127 1.55 -1.24 SuSE 8,678 1.34 8,905 1.36 -1.87 Scientific Linux 1,853 0.29 1,862 0.28 0.21 Oracle 1,019 0.16 1,045 0.16 -1.81 Turbolinux 511 0.08 510 0.08 0.89 Darwin 393 0.06 414 0.06 -4.42 Mandriva 313 0.05 333 0.05 -5.36 Netware 205 0.03 214 0.03 -3.54 Sun Cobalt 195 0.03 199 0.03 -1.33 Gentoo 159 0.02 162 0.02 -1.17 APMServ 89 0.01 95 0.01 -5.67 OpenVMS 69 0.01 73 0.01 -4.83 Mac OS X 55 0.01 56 0.01 -1.11 IBM 43 0.01 45 0.01 -3.78 ASPLinux 30 0.00 31 0.00 -2.56 Asianux 29 0.00 29 0.00 0.69 Trustix 27 0.00 30 0.00 -9.38 OpenPKG 21 0.00 21 0.00 0.69 BlueQuartz 20 0.00 20 0.00 0.69 OS/2 15 0.00 17 0.00 -11.15 White Box 15 0.00 15 0.00 0.69 ALT Linux 14 0.00 14 0.00 0.69 UnitedLinux 10 0.00 9 0.00 11.88 rPath 8 0.00 7 0.00 15.08 ClarkConnect 7 0.00 6 0.00 17.47 OpenNA 5 0.00 5 0.00 0.69 Lineox 3 0.00 2 0.00 51.04 RedFlag 1 0.00 1 0.00 0.69 PCLinuxOS 1 0.00 1 0.00 0.69 Haansoft 1 0.00 1 0.00 0.69 iSeries 1 0.00 1 0.00 0.69 Tao 1 0.00 1 0.00 0.69 Miracle 1 0.00 1 0.00 0.69 Cygwin 1 0.00 1 0.00 0.69

Note: Readers are cautioned that the Growth percentages are based on a server's market share penetration rather than the absolute number of servers we detected. Thus, it is possible for the number of servers to increase, while the growth is actually a negative value.

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