You are viewing an outdated report.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) 24,386,905 hostnames, but only 3,170,232 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	May 2007 Count	May 2007 %	April 2007 Count	April 2007 %	Growth %
Apache	1,814,218	57.23	1,801,309	57.22	0.02
Microsoft-IIS	912,398	28.78	909,552	28.89	-0.38
null	179,184	5.65	174,979	5.56	1.69
Rapidsite	66,109	2.09	66,003	2.10	-0.53
Apache-Coyote	17,572	0.55	17,123	0.54	1.91
Lotus-Domino	14,343	0.45	14,423	0.46	-1.24
A	14,175	0.45	13,976	0.44	0.72
IdeaWebServer	12,505	0.39	12,087	0.38	2.74
Netscape-Enterprise	12,490	0.39	12,721	0.40	-2.50
Apache-AdvancedExtranetServer	5,597	0.18	5,713	0.18	-2.71
NOYB	5,287	0.17	5,247	0.17	0.06
lighttpd	5,236	0.17	4,946	0.16	5.13
nginx	5,011	0.16	4,710	0.15	5.65
Zeus	4,690	0.15	4,717	0.15	-1.26
Zope	4,258	0.13	4,199	0.13	0.70
IBM_HTTP_Server	3,984	0.13	3,918	0.12	0.98
Sun-ONE-Web-Server	3,883	0.12	3,870	0.12	-0.36
WebServer	3,724	0.12	3,635	0.12	1.74
Resin	2,939	0.09	2,875	0.09	1.52
Oracle-Application-Server-10g	2,736	0.09	2,638	0.08	3.00
squid	2,551	0.08	2,469	0.08	2.61
Ipswitch-IMail	2,252	0.07	2,303	0.07	-2.89
IBM_HTTP_SERVER	2,238	0.07	2,299	0.07	-3.33
WebSTAR	2,041	0.06	2,098	0.07	-3.39
Cougar	1,809	0.06	1,813	0.06	-0.91
Oracle	1,561	0.05	1,587	0.05	-2.32
Jetty	1,549	0.05	1,554	0.05	-1.01
IceWarp	1,455	0.05	1,424	0.05	1.47
GWS	1,401	0.04	1,337	0.04	4.06
WebSitePro	1,390	0.04	1,434	0.05	-3.74
FileMakerPro	1,375	0.04	1,377	0.04	-0.84
WDaemon	1,347	0.04	1,322	0.04	1.18
WebLogic	1,302	0.04	1,317	0.04	-1.82
Boa	1,282	0.04	1,292	0.04	-1.46
WebSite	1,220	0.04	1,142	0.04	6.09
BIG-IP	1,166	0.04	1,108	0.04	4.51
4D_WebSTAR_S	1,083	0.03	1,098	0.03	-2.05
thttpd	1,021	0.03	1,024	0.03	-0.98
WebServerX	1,005	0.03	926	0.03	7.78
III	999	0.03	1,000	0.03	-0.79
AnWeb	975	0.03	1,063	0.03	-8.91
CommuniGatePro	971	0.03	981	0.03	-1.71
httpd+ssl	938	0.03	936	0.03	-0.48
EZproxy	769	0.02	765	0.02	-0.17
AOLserver	763	0.02	781	0.02	-2.98
Stronghold	741	0.02	746	0.02	-1.36
PowerSchool	739	0.02	733	0.02	0.12
Web	693	0.02	711	0.02	-3.21
AkamaiGHost	678	0.02	629	0.02	7.04
NetWare-Enterprise-Web-Server	659	0.02	690	0.02	-5.15
4D_WebStar_D	616	0.02	608	0.02	0.61
Oracle9iAS	615	0.02	645	0.02	-5.31
SAMBAR	606	0.02	613	0.02	-1.83
cpsrvd	586	0.02	574	0.02	1.38
WebtoB	547	0.02	539	0.02	0.78
Netscape-FastTrack	542	0.02	561	0.02	-4.06
DeleGate	524	0.02	530	0.02	-1.82
NetCache	522	0.02	522	0.02	-0.69
redir-httpd	507	0.02	508	0.02	-0.89
Orion	500	0.02	513	0.02	-3.21
LiteSpeed	500	0.02	481	0.02	3.23
EdgePrism	492	0.02	479	0.02	2.00
Roxen	431	0.01	439	0.01	-2.50
IBM-HTTP-Server	418	0.01	436	0.01	-4.79
NCSA	413	0.01	432	0.01	-5.06
WebSphere	388	0.01	383	0.01	0.60
Abyss	384	0.01	356	0.01	7.12
FirstClass	379	0.01	405	0.01	-7.07
Ultraseek	375	0.01	380	0.01	-2.00
ListManagerWeb	366	0.01	348	0.01	4.44
Xitami	362	0.01	358	0.01	0.42
OSU	351	0.01	361	0.01	-3.44
Acenet	344	0.01	373	0.01	-8.41
AppleShareIP	292	0.01	304	0.01	-4.61
Nost	287	0.01	282	0.01	1.07
Power	281	0.01	273	0.01	2.22
JRun	262	0.01	250	0.01	4.07
httpd	259	0.01	250	0.01	2.88
Indy	256	0.01	251	0.01	1.29
""	249	0.01	251	0.01	-1.48
IIS	242	0.01	209	0.01	14.99
Jeus	241	0.01	238	0.01	0.56
WWW	222	0.01	224	0.01	-1.58
Microsoft-HTTPAPI	218	0.01	215	0.01	0.69
Tcl-Webserver	209	0.01	215	0.01	-3.46
Polaris	200	0.01	206	0.01	-3.59
UserLand	193	0.01	193	0.01	-0.69
NS_6.1	193	0.01	186	0.01	3.04
Secured	192	0.01	170	0.01	12.16
Apache-NeoNova	185	0.01	185	0.01	-0.69
Webserver	184	0.01	183	0.01	-0.15
HPWB	182	0.01	177	0.01	2.11
Server	177	0.01	173	0.01	1.60
Powered	177	0.01	184	0.01	-4.47
Mittwald	174	0.01	165	0.01	4.72
NAB	172	0.01	175	0.01	-2.40
OpenSA	165	0.01	167	0.01	-1.88
Fujitsu-InfoProvider-Pro	162	0.01	162	0.01	-0.69
FJapache	162	0.01	0	0.00	N/A
Disallowed	162	0.01	167	0.01	-3.67

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.