You are viewing an outdated report.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) 36,382,388 hostnames, but only 3,687,020 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 2009 Count	May 2009 %	April 2009 Count	April 2009 %	Growth %
Apache	2,140,104	58.04	2,150,021	58.01	0.06
Microsoft-IIS	956,948	25.95	964,399	26.02	-0.25
null	263,433	7.14	264,208	7.13	0.23
Rapidsite	57,375	1.56	57,854	1.56	-0.31
nginx	30,056	0.82	29,695	0.80	1.75
Apache-Coyote	28,879	0.78	29,102	0.79	-0.25
IdeaWebServer	23,476	0.64	23,519	0.63	0.34
lighttpd	17,464	0.47	17,430	0.47	0.72
A	17,352	0.47	17,447	0.47	-0.02
Lotus-Domino	12,727	0.35	12,885	0.35	-0.71
Netscape-Enterprise	8,286	0.22	8,329	0.22	0.01
Microsoft-HTTPAPI	6,483	0.18	6,266	0.17	4.01
IBM_HTTP_Server	5,862	0.16	5,869	0.16	0.40
Zope	4,507	0.12	4,534	0.12	-0.07
squid	4,291	0.12	4,341	0.12	-0.63
Zeus	3,848	0.10	3,916	0.11	-1.22
Oracle-Application-Server-10g	3,786	0.10	3,796	0.10	0.26
Sun-ONE-Web-Server	3,763	0.10	3,805	0.10	-0.59
LiteSpeed	3,575	0.10	3,523	0.10	2.01
Resin	3,356	0.09	3,386	0.09	-0.37
Apache-AdvancedExtranetServer	2,649	0.07	2,707	0.07	-1.63
BigIP	2,502	0.07	2,438	0.07	3.16
AkamaiGHost	2,449	0.07	2,145	0.06	14.77
Cougar	2,160	0.06	2,215	0.06	-1.97
WebServer	1,995	0.05	2,012	0.05	-0.33
GWS	1,949	0.05	1,957	0.05	0.11
NOYB	1,668	0.05	1,655	0.04	1.31
IceWarp	1,543	0.04	1,549	0.04	0.13
WDaemon	1,537	0.04	1,560	0.04	-0.96
WebServerX	1,531	0.04	1,548	0.04	-0.58
Jetty	1,485	0.04	1,512	0.04	-1.27
IBM_HTTP_SERVER	1,440	0.04	1,455	0.04	-0.51
WWW	1,399	0.04	1,399	0.04	0.52
Oracle	1,272	0.03	1,286	0.03	-0.57
Ipswitch-IMail	1,261	0.03	1,264	0.03	0.29
Boa	1,207	0.03	1,204	0.03	0.77
EZproxy	1,205	0.03	1,198	0.03	1.11
Web	1,118	0.03	1,127	0.03	-0.28
thttpd	1,116	0.03	1,121	0.03	0.08
III	1,096	0.03	1,090	0.03	1.08
WebLogic	1,074	0.03	1,093	0.03	-1.22
PowerSchool	1,042	0.03	1,054	0.03	-0.62
WebSTAR	1,026	0.03	1,027	0.03	0.43
CommuniGatePro	971	0.03	979	0.03	-0.30
AnWeb	951	0.03	974	0.03	-1.85
FileMakerPro	897	0.02	909	0.02	-0.80
Sun-Java-System-Web-Server	847	0.02	898	0.02	-5.18
BIG-IP	828	0.02	854	0.02	-2.54
httpd	814	0.02	813	0.02	0.65
cpsrvd	697	0.02	710	0.02	-1.32
WebSitePro	686	0.02	690	0.02	-0.06
4D_WebStar_D	674	0.02	675	0.02	0.38
WebtoB	637	0.02	647	0.02	-1.03
4D_WebSTAR_S	632	0.02	630	0.02	0.84
ListManagerWeb	622	0.02	622	0.02	0.52
AOLserver	603	0.02	602	0.02	0.69
WebSite	581	0.02	843	0.02	-30.72
gws	552	0.01	585	0.02	-5.15
DeleGate	523	0.01	523	0.01	0.52
lighttpd-yt	521	0.01	526	0.01	-0.43
ThirdSphere	520	0.01	520	0.01	0.52
redir-httpd	513	0.01	511	0.01	0.92
HTTPD	476	0.01	475	0.01	0.74
SAMBAR	431	0.01	438	0.01	-1.08
""	422	0.01	440	0.01	-3.59
Blocked	421	0.01	422	0.01	0.29
Nost	417	0.01	419	0.01	0.04
Abyss	416	0.01	430	0.01	-2.75
JRun	412	0.01	412	0.01	0.52
Sun	410	0.01	409	0.01	0.77
Secured	395	0.01	393	0.01	1.04
NetCache	386	0.01	399	0.01	-2.75
Stronghold	381	0.01	388	0.01	-1.29
Power	381	0.01	365	0.01	4.93
WebSphere	375	0.01	387	0.01	-2.59
Roxen	370	0.01	374	0.01	-0.55
Oracle9iAS	342	0.01	343	0.01	0.23
Rumpus	327	0.01	329	0.01	-0.09
Ultraseek	324	0.01	326	0.01	-0.09
Orion	317	0.01	326	0.01	-2.25
ENIAC	317	0.01	317	0.01	0.52
MediaFire-HTTP	304	0.01	290	0.01	5.38
Indy	303	0.01	308	0.01	-1.11
Server	284	0.01	285	0.01	0.17
NetWare-Enterprise-Web-Server	279	0.01	284	0.01	-1.25
IIS	274	0.01	284	0.01	-3.02
NCSA	264	0.01	267	0.01	-0.61
Powered	262	0.01	269	0.01	-2.09
OSU	254	0.01	254	0.01	0.52
CoralWebPrx	253	0.01	0	0.00	N/A
DinaHTTPd	246	0.01	252	0.01	-1.87
Xitami	236	0.01	242	0.01	-1.97
Netscape-FastTrack	225	0.01	227	0.01	-0.36
SAP	223	0.01	220	0.01	1.90
Kerio	210	0.01	207	0.01	1.98
EdgePrism	206	0.01	229	0.01	-9.57
httpd+ssl	204	0.01	220	0.01	-6.79
Hanbiro	202	0.01	204	0.01	-0.46
Polaris	200	0.01	205	0.01	-1.93
FJapache	198	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.