You are viewing an outdated report.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) 11,934,124 hostnames, but only 2,280,977 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 2003 Count	September 2003 %	August 2003 Count	August 2003 %	Growth %
Apache	1,206,795	52.91	1,184,441	52.93	-0.03
Microsoft-IIS	790,809	34.67	775,017	34.63	0.11
Rapidsite	76,295	3.34	75,084	3.36	-0.30
null	39,497	1.73	38,363	1.71	1.01
Netscape-Enterprise	31,772	1.39	31,853	1.42	-2.14
Lotus-Domino	15,797	0.69	15,567	0.70	-0.44
Apache-AdvancedExtranetServer	8,542	0.37	8,226	0.37	1.88
A	7,658	0.34	7,480	0.33	0.45
WebSTAR	6,530	0.29	6,535	0.29	-1.96
Zeus	6,293	0.28	6,263	0.28	-1.42
WebSitePro	6,128	0.27	6,179	0.28	-2.70
WN	4,990	0.22	5,011	0.22	-2.30
Stronghold	4,616	0.20	4,635	0.21	-2.29
IdeaWebServer	4,157	0.18	4,092	0.18	-0.33
NetWare-Enterprise-Web-Server	3,110	0.14	3,094	0.14	-1.38
Ipswitch-IMail	3,043	0.13	2,922	0.13	2.18
WebSite	2,846	0.12	2,796	0.12	-0.13
Netscape-FastTrack	2,381	0.10	2,411	0.11	-3.11
IBM_HTTP_Server	2,181	0.10	2,141	0.10	-0.05
FileMakerPro	2,135	0.09	2,077	0.09	0.85
IBM_HTTP_SERVER	1,947	0.09	1,867	0.08	2.32
Zope	1,856	0.08	1,748	0.08	4.18
Oracle	1,853	0.08	1,757	0.08	3.47
IBM-HTTP-Server	1,549	0.07	1,543	0.07	-1.50
NCSA	1,470	0.06	1,517	0.07	-4.93
AppleShareIP	1,309	0.06	1,278	0.06	0.49
FirstClass	1,266	0.06	1,235	0.06	0.58
Resin	1,051	0.05	970	0.04	6.31
WebLogic	1,028	0.05	996	0.04	1.27
4D_WebSTAR_S	1,006	0.04	947	0.04	4.23
WebServer	996	0.04	935	0.04	4.51
SAMBAR	825	0.04	818	0.04	-1.05
Oracle9iAS	748	0.03	711	0.03	3.22
HPWB	727	0.03	763	0.03	-6.52
Jetty	720	0.03	667	0.03	5.91
Xitami	704	0.03	685	0.03	0.84
AOLserver	699	0.03	677	0.03	1.30
thttpd	678	0.03	663	0.03	0.33
Roxen·Challenger	677	0.03	687	0.03	-3.31
Oracle_Web_Listener	659	0.03	668	0.03	-3.21
WDaemon	642	0.03	613	0.03	2.76
Cougar	640	0.03	633	0.03	-0.80
CommuniGatePro	629	0.03	621	0.03	-0.62
AnWeb	620	0.03	525	0.02	15.87
CERN	619	0.03	616	0.03	-1.41
httpd+ssl	610	0.03	578	0.03	3.55
Lasso	604	0.03	595	0.03	-0.40
Roxen	582	0.03	559	0.02	2.15
Orion	563	0.02	553	0.02	-0.11
OSU	554	0.02	555	0.02	-2.06
Netscape-Communications	520	0.02	543	0.02	-6.04
WWW	512	0.02	511	0.02	-1.69
Boa	509	0.02	491	0.02	1.71
Squid	468	0.02	452	0.02	1.59
Statistics	451	0.02	457	0.02	-3.17
Novell-HTTP-Server	430	0.02	427	0.02	-1.20
Web	423	0.02	427	0.02	-2.81
MACOS_Personal_Websharing	421	0.02	412	0.02	0.26
Domino-Go-Webserver	408	0.02	411	0.02	-2.60
squid	390	0.02	355	0.02	7.79
OmniHTTPd	383	0.02	373	0.02	0.74
4D_WebStar_D	382	0.02	361	0.02	3.82
Inktomi	345	0.02	353	0.02	-4.11
IceWarp	333	0.01	309	0.01	5.73
OpenSA	266	0.01	249	0.01	4.81
Red	260	0.01	255	0.01	0.04
QuidProQuo	239	0.01	235	0.01	-0.22
UserLand	234	0.01	226	0.01	1.59
Apache-NeoNova	231	0.01	215	0.01	5.42
oXeo	228	0.01	222	0.01	0.77
JavaWebServer	220	0.01	212	0.01	1.82
DeleGate	220	0.01	219	0.01	-1.44
EZproxy	217	0.01	196	0.01	8.63
Ultraseek	210	0.01	202	0.01	2.00
Purveyor	204	0.01	212	0.01	-5.59
Web_Server_4D	202	0.01	201	0.01	-1.40
Netscape-Commerce	199	0.01	200	0.01	-2.38
MacHTTP	199	0.01	193	0.01	1.16
MHttpd	196	0.01	192	0.01	0.16
NaviServer	194	0.01	179	0.01	6.34
cpaneld	193	0.01	135	0.01	40.27
mod_perl	186	0.01	186	0.01	-1.89
Netrox-Apache	178	0.01	204	0.01	-14.39
Caudium	172	0.01	174	0.01	-3.01
Worldgroup	171	0.01	172	0.01	-2.46
IBM	168	0.01	174	0.01	-5.27
MDNServer	166	0.01	169	0.01	-3.63
Tomcat	164	0.01	157	0.01	2.49
JRun	164	0.01	159	0.01	1.20
Internet	164	0.01	162	0.01	-0.67
NetCache	157	0.01	158	0.01	-2.51
Unknown	151	0.01	150	0.01	-1.23
HP	151	0.01	153	0.01	-3.17
HP-UX_Apache-based_Web_Server	150	0.01	151	0.01	-2.54
Tcl-Webserver	145	0.01	0	0.00	N/A
Wapapi	137	0.01	140	0.01	-3.99
WebtoB	134	0.01	123	0.01	6.89
Fujitsu-InfoProvider-Pro	129	0.01	126	0.01	0.45
LiveStats	127	0.01	0	0.00	N/A
HTTP	127	0.01	128	0.01	-2.65

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.