You are viewing an outdated report. The latest version of this report was published on February 1st, 2019
OS/Linux Distributions using Apache
January 1st, 1999
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.
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
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
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">
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.
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.
|Reporting by Hostname (Sample size: 13,784 web sites)|
In this month's survey, 674,879 Apache
servers were detected, but only 13,784 (2.04%) 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.
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
|Reporting by Installation (Sample size: 5,110 IP Addresses)|
In this month's survey, 414,969 distinct
IP Addresses hosted Apache servers, but
only 5,110 (1.23%) revealed
sufficient information to detect the host OS. The data below is based
on this subset of servers that revealed the host OS.
IP Address Count
IP Address Count
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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