You are viewing an outdated report.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) 23,854,711 hostnames, but only 3,148,262 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	April 2007 Count	April 2007 %	March 2007 Count	March 2007 %	Growth %
Apache	1,801,309	57.22	1,784,491	57.30	-0.15
Microsoft-IIS	909,552	28.89	904,797	29.05	-0.57
null	174,979	5.56	164,843	5.29	5.00
Rapidsite	66,003	2.10	65,572	2.11	-0.44
Apache-Coyote	17,123	0.54	16,442	0.53	3.01
Lotus-Domino	14,423	0.46	14,436	0.46	-1.17
A	13,976	0.44	13,721	0.44	0.75
Netscape-Enterprise	12,721	0.40	13,296	0.43	-5.36
IdeaWebServer	12,087	0.38	11,571	0.37	3.33
Apache-AdvancedExtranetServer	5,713	0.18	5,904	0.19	-4.29
NOYB	5,247	0.17	5,350	0.17	-2.99
lighttpd	4,946	0.16	4,837	0.16	1.14
Zeus	4,717	0.15	4,770	0.15	-2.18
nginx	4,710	0.15	4,379	0.14	6.39
Zope	4,199	0.13	4,152	0.13	0.03
IBM_HTTP_Server	3,918	0.12	3,856	0.12	0.50
Sun-ONE-Web-Server	3,870	0.12	3,828	0.12	-0.00
WebServer	3,635	0.12	3,547	0.11	1.37
Resin	2,875	0.09	2,869	0.09	-0.88
Oracle-Application-Server-10g	2,638	0.08	2,589	0.08	0.79
squid	2,469	0.08	2,319	0.07	5.31
Ipswitch-IMail	2,303	0.07	2,368	0.08	-3.80
IBM_HTTP_SERVER	2,299	0.07	2,363	0.08	-3.76
WebSTAR	2,098	0.07	2,151	0.07	-3.52
Cougar	1,813	0.06	1,697	0.05	5.68
Oracle	1,587	0.05	1,581	0.05	-0.71
Jetty	1,554	0.05	1,497	0.05	2.68
WebSitePro	1,434	0.05	1,480	0.05	-4.16
IceWarp	1,424	0.05	1,389	0.04	1.41
FileMakerPro	1,377	0.04	1,409	0.05	-3.33
GWS	1,337	0.04	1,282	0.04	3.16
WDaemon	1,322	0.04	1,295	0.04	0.98
WebLogic	1,317	0.04	1,331	0.04	-2.13
Boa	1,292	0.04	1,226	0.04	4.24
WebSite	1,142	0.04	1,199	0.04	-5.79
BIG-IP	1,108	0.04	1,009	0.03	8.62
4D_WebSTAR_S	1,098	0.03	1,121	0.04	-3.11
AnWeb	1,063	0.03	1,070	0.03	-1.73
thttpd	1,024	0.03	999	0.03	1.39
III	1,000	0.03	987	0.03	0.22
CommuniGatePro	981	0.03	969	0.03	0.14
httpd+ssl	936	0.03	938	0.03	-1.30
WebServerX	926	0.03	789	0.03	16.09
AOLserver	781	0.02	770	0.02	0.33
EZproxy	765	0.02	754	0.02	0.36
Stronghold	746	0.02	767	0.02	-3.79
PowerSchool	733	0.02	714	0.02	1.55
Web	711	0.02	708	0.02	-0.67
NetWare-Enterprise-Web-Server	690	0.02	720	0.02	-5.21
Oracle9iAS	645	0.02	658	0.02	-3.04
AkamaiGHost	629	0.02	598	0.02	4.04
SAMBAR	613	0.02	625	0.02	-2.98
4D_WebStar_D	608	0.02	589	0.02	2.11
cpsrvd	574	0.02	574	0.02	-1.09
Netscape-FastTrack	561	0.02	572	0.02	-2.99
WebtoB	539	0.02	545	0.02	-2.17
DeleGate	530	0.02	532	0.02	-1.46
NetCache	522	0.02	573	0.02	-9.89
Orion	513	0.02	520	0.02	-2.42
redir-httpd	508	0.02	506	0.02	-0.69
LiteSpeed	481	0.02	433	0.01	9.88
EdgePrism	479	0.02	450	0.01	5.29
Roxen	439	0.01	455	0.01	-4.56
IBM-HTTP-Server	436	0.01	460	0.01	-6.25
NCSA	432	0.01	446	0.01	-4.19
FirstClass	405	0.01	454	0.01	-11.76
WebSphere	383	0.01	368	0.01	2.95
Ultraseek	380	0.01	374	0.01	0.50
Acenet	373	0.01	377	0.01	-2.13
OSU	361	0.01	362	0.01	-1.36
Xitami	358	0.01	361	0.01	-1.91
Abyss	356	0.01	354	0.01	-0.53
ListManagerWeb	348	0.01	343	0.01	0.36
AppleShareIP	304	0.01	318	0.01	-5.44
Nost	282	0.01	287	0.01	-2.81
Power	273	0.01	213	0.01	26.78
Indy	251	0.01	239	0.01	3.88
""	251	0.01	260	0.01	-4.51
httpd	250	0.01	244	0.01	1.35
JRun	250	0.01	258	0.01	-4.15
Jeus	238	0.01	234	0.01	0.61
WWW	224	0.01	217	0.01	2.11
Tcl-Webserver	215	0.01	228	0.01	-6.73
Microsoft-HTTPAPI	215	0.01	216	0.01	-1.54
IIS	209	0.01	245	0.01	-15.62
Polaris	206	0.01	205	0.01	-0.60
UserLand	193	0.01	198	0.01	-3.58
NS_6.1	186	0.01	168	0.01	9.51
Apache-NeoNova	185	0.01	181	0.01	1.10
Powered	184	0.01	185	0.01	-1.62
Webserver	183	0.01	185	0.01	-2.15
HPWB	177	0.01	189	0.01	-7.37
NAB	175	0.01	174	0.01	-0.52
Server	173	0.01	166	0.01	3.09
Secured	170	0.01	0	0.00	N/A
OpenSA	167	0.01	173	0.01	-4.52
Disallowed	167	0.01	169	0.01	-2.26
Mittwald	165	0.01	0	0.00	N/A
eSoft	163	0.01	181	0.01	-10.92
Fujitsu-InfoProvider-Pro	162	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.