You are viewing an outdated report.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

Web server surveys have been around for a long time. One of the problems with running a survey is how to produce meaningful results given the number of choices with the collection and reporting methodologies. Some examples:

• How does one treat wildcarded DNS sites that generate unlimited number of unique hostnames, all residing on the same system?
• How does one treat taste-testing web sites that do not have any unique content on them at all?
• If very large number of web sites reside on a single IP address, is it a a case of search engine spamming, a large number of low traffic web sites on a single platform, or a web hosting facility using load-redirection for a large number of legitimate web sites?
• How "greedy" or aggressive should the hunt for new web sites be?

All of the above are issues that our conventional web server survey deals with. The biggest issue that comes up time and again, however, is the fact that our conventional survey counts unique hostnames, not unique installations. This can seriously impact market share statistics. Case in point: the data set used both web server survey reports contains (for the last month's data set) 20,773,757 hostnames, but only 2,974,221 distinct IP addresses.

This particular report addresses this in part by counting unique IP addresses in an attempt at answering the question of how many installations of a particular server might exist. By using the IP address as a proxy for the physical hardware on which a server is running, we still need to be aware that it is not a perfect 1 to 1 mapping:

• A load balanced network of servers might share a single public facing IP address, and be undercounted.
• A single server may have multiple public IP addresses bound to one or more network cards on the system, and thus still be counted more than once.

While not a perfect solution, we feel that counting web servers by IP will give a much closer view of the number of server installs for a given technology.

Click any server to see detailed graphs and histories.

Server	September 2006 Count	September 2006 %	August 2006 Count	August 2006 %	Growth %
Apache	1,693,936	56.95	1,664,879	56.82	0.23
Microsoft-IIS	887,584	29.84	882,262	30.11	-0.89
null	140,388	4.72	133,784	4.57	3.38
Rapidsite	67,263	2.26	67,321	2.30	-1.57
Netscape-Enterprise	15,017	0.50	15,360	0.52	-3.68
Lotus-Domino	14,724	0.50	14,737	0.50	-1.57
Apache-Coyote	13,204	0.44	12,455	0.43	4.44
A	12,845	0.43	12,526	0.43	1.02
IdeaWebServer	9,561	0.32	9,155	0.31	2.88
Apache-AdvancedExtranetServer	7,142	0.24	7,378	0.25	-4.64
Zeus	4,810	0.16	4,804	0.16	-1.36
NOYB	4,581	0.15	4,287	0.15	5.27
Sun-ONE-Web-Server	4,430	0.15	4,319	0.15	1.05
Zope	3,801	0.13	3,684	0.13	1.64
IBM_HTTP_Server	3,415	0.11	3,316	0.11	1.46
WebServer	3,155	0.11	3,069	0.10	1.28
lighttpd	3,078	0.10	2,722	0.09	11.40
Ipswitch-IMail	2,852	0.10	2,947	0.10	-4.66
nginx	2,649	0.09	2,527	0.09	3.27
IBM_HTTP_SERVER	2,626	0.09	2,661	0.09	-2.78
Resin	2,614	0.09	2,587	0.09	-0.46
WebSTAR	2,504	0.08	2,555	0.09	-3.45
squid	2,278	0.08	2,171	0.07	3.37
Oracle-Application-Server-10g	2,198	0.07	2,105	0.07	2.87
WebSitePro	1,928	0.06	2,015	0.07	-5.74
Oracle	1,687	0.06	1,686	0.06	-1.43
FileMakerPro	1,523	0.05	1,470	0.05	2.07
Jetty	1,494	0.05	1,473	0.05	-0.08
Cougar	1,456	0.05	1,412	0.05	1.59
WebSite	1,385	0.05	1,450	0.05	-5.90
WebLogic	1,321	0.04	1,293	0.04	0.65
IceWarp	1,302	0.04	1,284	0.04	-0.10
4D_WebSTAR_S	1,266	0.04	1,278	0.04	-2.41
WDaemon	1,239	0.04	1,211	0.04	0.79
Boa	1,083	0.04	1,028	0.04	3.79
Stronghold	1,035	0.03	1,093	0.04	-6.71
thttpd	1,014	0.03	1,022	0.03	-2.26
III	956	0.03	936	0.03	0.62
CommuniGatePro	941	0.03	944	0.03	-1.80
httpd+ssl	919	0.03	901	0.03	0.48
AnWeb	894	0.03	858	0.03	2.65
NetWare-Enterprise-Web-Server	892	0.03	925	0.03	-5.00
GWS	890	0.03	802	0.03	9.33
AOLserver	780	0.03	758	0.03	1.37
Oracle9iAS	755	0.03	768	0.03	-3.15
Netscape-FastTrack	714	0.02	725	0.02	-2.98
EZproxy	682	0.02	665	0.02	1.03
BIG-IP	673	0.02	639	0.02	3.76
FirstClass	665	0.02	724	0.02	-9.51
AkamaiGHost	649	0.02	650	0.02	-1.64
Web	646	0.02	630	0.02	1.02
SAMBAR	630	0.02	627	0.02	-1.01
PowerSchool	575	0.02	540	0.02	4.90
WebSphere	563	0.02	604	0.02	-8.17
IBM-HTTP-Server	555	0.02	565	0.02	-3.23
4D_WebStar_D	553	0.02	533	0.02	2.21
Orion	550	0.02	545	0.02	-0.58
NetCache	539	0.02	543	0.02	-2.21
cpsrvd	536	0.02	521	0.02	1.35
DeleGate	518	0.02	516	0.02	-1.10
redir-httpd	504	0.02	505	0.02	-1.68
NCSA	501	0.02	494	0.02	-0.09
WebtoB	490	0.02	466	0.02	3.59
Roxen	406	0.01	405	0.01	-1.24
Xitami	405	0.01	396	0.01	0.75
AppleShareIP	395	0.01	394	0.01	-1.23
Ultraseek	379	0.01	367	0.01	1.74
OSU	375	0.01	374	0.01	-1.22
Abyss	321	0.01	305	0.01	3.68
lunarpages	305	0.01	0	0.00	N/A
ListManagerWeb	282	0.01	272	0.01	2.14
Disallowed	266	0.01	312	0.01	-16.01
""	256	0.01	249	0.01	1.28
Simple,	255	0.01	272	0.01	-7.64
Apache-NeoNova	244	0.01	244	0.01	-1.48
JRun	243	0.01	240	0.01	-0.25
HPWB	241	0.01	256	0.01	-7.26
kucci	237	0.01	237	0.01	-1.48
LiteSpeed	237	0.01	205	0.01	13.89
IIS	231	0.01	219	0.01	3.91
Nost	230	0.01	216	0.01	4.90
EdgePrism	230	0.01	213	0.01	6.38
Indy	217	0.01	207	0.01	3.27
UserLand	209	0.01	200	0.01	2.95
eSoft	208	0.01	211	0.01	-2.89
Tcl-Webserver	202	0.01	193	0.01	3.11
httpd	201	0.01	189	0.01	4.77
Squid	200	0.01	203	0.01	-2.94
Polaris	198	0.01	199	0.01	-1.98
NAB	193	0.01	189	0.01	0.60
OpenSA	191	0.01	197	0.01	-4.49
Blocked	190	0.01	213	0.01	-12.12
Roxen·Challenger	189	0.01	192	0.01	-3.02
Jeus	186	0.01	179	0.01	2.37
Powered	184	0.01	191	0.01	-5.10
Oracle_Web_Listener	184	0.01	194	0.01	-6.56
Webserver	183	0.01	189	0.01	-4.61
CERN	182	0.01	176	0.01	1.87
Microsoft-HTTPAPI	180	0.01	177	0.01	0.19
WWW	175	0.01	0	0.00	N/A

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.