You are viewing an outdated report. The latest version of this report was published on May 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) 9,423,350 hostnames, but only 2,136,967 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	March 2003 Count	March 2003 %	February 2003 Count	February 2003 %	Growth %
Apache	1,116,592	52.25	1,090,920	52.48	-0.43
Microsoft-IIS	750,274	35.11	723,238	34.79	0.92
Rapidsite	69,979	3.27	67,086	3.23	1.47
Netscape-Enterprise	34,584	1.62	34,878	1.68	-3.54
null	33,500	1.57	31,759	1.53	2.61
Lotus-Domino	15,120	0.71	14,906	0.72	-1.32
Apache-AdvancedExtranetServer	7,766	0.36	7,543	0.36	0.16
WebSTAR	7,446	0.35	7,594	0.37	-4.62
WebSitePro	7,323	0.34	7,496	0.36	-4.97
A	6,448	0.30	6,105	0.29	2.74
Zeus	6,014	0.28	5,970	0.29	-2.00
WN	5,375	0.25	5,367	0.26	-2.58
Stronghold	5,191	0.24	5,295	0.25	-4.63
IdeaWebServer	3,921	0.18	3,863	0.19	-1.26
NetWare-Enterprise-Web-Server	3,291	0.15	3,227	0.16	-0.79
Netscape-FastTrack	2,908	0.14	2,925	0.14	-3.29
WebSite	2,590	0.12	2,640	0.13	-4.56
Ipswitch-IMail	2,501	0.12	2,364	0.11	2.92
IBM_HTTP_Server	2,274	0.11	2,247	0.11	-1.55
FileMakerPro	2,101	0.10	2,067	0.10	-1.12
NCSA	1,891	0.09	1,955	0.09	-5.91
IBM-HTTP-Server	1,583	0.07	1,533	0.07	0.45
AppleShareIP	1,558	0.07	1,576	0.08	-3.83
Oracle	1,555	0.07	1,481	0.07	2.14
IBM_HTTP_SERVER	1,411	0.07	1,288	0.06	6.57
Zope	1,394	0.07	1,310	0.06	3.52
FirstClass	1,185	0.06	1,157	0.06	-0.37
Roxen·Challenger	1,111	0.05	1,139	0.05	-5.11
HPWB	950	0.04	976	0.05	-5.31
Squid	887	0.04	1,823	0.09	-52.67
WebLogic	839	0.04	817	0.04	-0.10
SAMBAR	819	0.04	781	0.04	2.01
Oracle_Web_Listener	807	0.04	802	0.04	-2.11
Resin	786	0.04	727	0.03	5.17
CERN	781	0.04	804	0.04	-5.50
Xitami	747	0.03	738	0.04	-1.53
4D_WebSTAR_S	666	0.03	613	0.03	5.69
WebServer	618	0.03	619	0.03	-2.88
Netscape-Communications	614	0.03	633	0.03	-5.64
AOLserver	602	0.03	590	0.03	-0.74
OSU	588	0.03	594	0.03	-3.70
Lasso	580	0.03	573	0.03	-1.53
thttpd	563	0.03	544	0.03	0.68
Roxen	534	0.02	544	0.03	-4.51
Novell-HTTP-Server	529	0.02	547	0.03	-5.92
WDaemon	527	0.02	471	0.02	8.85
CommuniGatePro	519	0.02	498	0.02	1.38
Cougar	513	0.02	487	0.02	2.47
Oracle9iAS	486	0.02	436	0.02	8.43
Orion	480	0.02	469	0.02	-0.44
Domino-Go-Webserver	476	0.02	495	0.02	-6.45
AnWeb	472	0.02	417	0.02	10.11
Statistics	468	0.02	465	0.02	-2.09
MACOS_Personal_Websharing	463	0.02	441	0.02	2.13
WWW	456	0.02	440	0.02	0.82
httpd+ssl	430	0.02	405	0.02	3.28
Web	422	0.02	441	0.02	-6.91
Boa	416	0.02	379	0.02	6.78
Patchy	393	0.02	392	0.02	-2.47
Jetty	388	0.02	327	0.02	15.43
Inktomi	385	0.02	381	0.02	-1.70
OmniHTTPd	370	0.02	357	0.02	0.82
4D_WebStar_D	326	0.02	293	0.01	8.24
Red	279	0.01	287	0.01	-5.43
squid	278	0.01	221	0.01	22.37
Apache-NeoNova	277	0.01	269	0.01	0.17
QuidProQuo	269	0.01	269	0.01	-2.72
JavaWebServer	252	0.01	247	0.01	-0.75
OpenSA	250	0.01	248	0.01	-1.94
Netscape-Commerce	246	0.01	266	0.01	-10.04
MacHTTP	240	0.01	239	0.01	-2.31
mod_perl	227	0.01	233	0.01	-5.23
Purveyor	220	0.01	223	0.01	-4.03
UserLand	219	0.01	225	0.01	-5.31
NaviServer	212	0.01	207	0.01	-0.37
Web_Server_4D	206	0.01	202	0.01	-0.79
Netrox-Apache	204	0.01	199	0.01	-0.28
Caudium	202	0.01	215	0.01	-8.60
IceWarp	192	0.01	157	0.01	18.97
MHttpd	183	0.01	175	0.01	1.73
Worldgroup	180	0.01	181	0.01	-3.26
IBM	169	0.01	165	0.01	-0.36
Internet	168	0.01	163	0.01	0.26
Ultraseek	166	0.01	162	0.01	-0.32
Commerce-Builder	156	0.01	155	0.01	-2.09
MDNServer	155	0.01	152	0.01	-0.80
JRun	152	0.01	135	0.01	9.53
HP	150	0.01	132	0.01	10.54
Unknown	149	0.01	149	0.01	-2.72
NetCache	145	0.01	143	0.01	-1.36
Sun_WebServer	140	0.01	139	0.01	-2.02
Powered	138	0.01	139	0.01	-3.42
Tomcat	136	0.01	123	0.01	7.56
oXeo	135	0.01	122	0.01	7.64
ALEPH	128	0.01	125	0.01	-0.39
Wapapi	125	0.01	0	0.00	N/A
Microsoft-PWS-95	124	0.01	130	0.01	-7.21
SilverStream	121	0.01	129	0.01	-8.75
HTTP	119	0.01	0	0.00	N/A
Fujitsu-InfoProvider-Pro	119	0.01	115	0.01	0.66

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.