You are viewing an outdated report.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) 53,611,875 hostnames, but only 4,511,822 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 2011 Count	April 2011 %	March 2011 Count	March 2011 %	Growth %
Apache	2,664,774	59.06	2,637,544	58.99	0.12
Microsoft-IIS	1,013,710	22.47	1,015,322	22.71	-1.06
null	347,330	7.70	342,340	7.66	0.54
nginx	121,854	2.70	114,789	2.57	5.19
Rapidsite	46,235	1.02	47,229	1.06	-2.99
Microsoft-HTTPAPI	45,536	1.01	42,608	0.95	5.90
Apache-Coyote	44,064	0.98	43,864	0.98	-0.45
IdeaWebServer	36,548	0.81	35,879	0.80	0.94
lighttpd	19,038	0.42	18,931	0.42	-0.35
A	16,712	0.37	16,976	0.38	-2.45
LiteSpeed	14,515	0.32	13,963	0.31	3.01
Lotus-Domino	11,594	0.26	11,753	0.26	-2.25
IBM_HTTP_Server	6,765	0.15	6,749	0.15	-0.67
BigIP	5,995	0.13	5,849	0.13	1.57
squid	4,758	0.11	4,726	0.11	-0.23
Oracle-Application-Server-10g	4,064	0.09	4,104	0.09	-1.87
Zope	3,939	0.09	4,010	0.09	-2.66
Resin	3,381	0.07	3,444	0.08	-2.72
AkamaiGHost	3,253	0.07	3,324	0.07	-3.02
Zeus	2,723	0.06	2,776	0.06	-2.80
Sun-ONE-Web-Server	2,683	0.06	2,746	0.06	-3.18
Netscape-Enterprise	2,483	0.06	2,542	0.06	-3.21
Cougar	2,393	0.05	2,368	0.05	0.14
WDaemon	1,749	0.04	1,773	0.04	-2.25
HTTPD	1,747	0.04	1,627	0.04	6.40
apache	1,711	0.04	1,664	0.04	1.89
EZproxy	1,703	0.04	1,680	0.04	0.45
IceWarp	1,622	0.04	1,631	0.04	-1.45
GWS	1,555	0.03	1,582	0.04	-2.60
PowerSchool	1,491	0.03	1,496	0.03	-1.24
Apache-AdvancedExtranetServer	1,362	0.03	1,421	0.03	-5.02
Sun-Java-System-Web-Server	1,255	0.03	1,274	0.03	-2.38
III	1,171	0.03	1,172	0.03	-0.99
Jetty	1,138	0.03	1,142	0.03	-1.25
thttpd	1,136	0.03	1,158	0.03	-2.79
Web	1,129	0.03	1,133	0.03	-1.26
Oracle	1,067	0.02	1,098	0.02	-3.70
Boa	1,064	0.02	1,080	0.02	-2.37
httpd	994	0.02	999	0.02	-1.40
Cherokee	924	0.02	872	0.02	5.00
CommuniGatePro	923	0.02	920	0.02	-0.58
WebServerX	881	0.02	890	0.02	-1.91
cpsrvd	862	0.02	854	0.02	0.02
NOYB	856	0.02	888	0.02	-4.48
AnWeb	807	0.02	684	0.02	16.91
Sun	806	0.02	809	0.02	-1.27
ListManagerWeb	778	0.02	780	0.02	-1.16
IBM_HTTP_SERVER	766	0.02	808	0.02	-6.06
WWW	744	0.02	759	0.02	-2.86
Ipswitch-IMail	742	0.02	769	0.02	-4.38
Rumpus	673	0.01	695	0.02	-4.04
WebtoB	652	0.01	659	0.01	-1.96
sffe	639	0.01	612	0.01	3.47
Varnish	625	0.01	559	0.01	10.79
4D_WebStar_D	619	0.01	637	0.01	-3.71
FileMakerPro	568	0.01	576	0.01	-2.28
WebSTAR	558	0.01	567	0.01	-2.48
xServers	546	0.01	499	0.01	8.43
Bomgar	539	0.01	534	0.01	0.02
BIG-IP	520	0.01	496	0.01	3.89
redir-httpd	515	0.01	516	0.01	-1.10
WebLogic	499	0.01	510	0.01	-3.04
DeleGate	464	0.01	465	0.01	-1.12
AOLserver	445	0.01	469	0.01	-5.98
Abyss	418	0.01	422	0.01	-1.84
-	404	0.01	245	0.01	63.40
WebSite	403	0.01	441	0.01	-9.44
Server	401	0.01	397	0.01	0.09
WebSphere	398	0.01	396	0.01	-0.41
JRun	395	0.01	409	0.01	-4.30
WebSitePro	379	0.01	390	0.01	-3.70
WebServer	374	0.01	382	0.01	-2.98
Secured	370	0.01	402	0.01	-8.79
ideastack.com	364	0.01	0	0.00	N/A
EdgePrism	363	0.01	344	0.01	4.57
4D_WebSTAR_S	355	0.01	363	0.01	-3.09
FC	351	0.01	345	0.01	0.82
Kvchosting.com	340	0.01	423	0.01	-20.35
Indy	339	0.01	339	0.01	-0.91
Power	330	0.01	371	0.01	-11.86
SW	319	0.01	314	0.01	0.67
Roxen	305	0.01	309	0.01	-2.19
""	296	0.01	288	0.01	1.85
SAP	294	0.01	292	0.01	-0.23
SAMBAR	291	0.01	295	0.01	-2.25
IIS	266	0.01	268	0.01	-1.65
Stronghold	259	0.01	265	0.01	-3.15
CloudFront	259	0.01	254	0.01	1.05
GlassFish	256	0.01	256	0.01	-0.91
RomPager	251	0.01	243	0.01	2.36
IIS6	244	0.01	242	0.01	-0.09
NetCache	242	0.01	247	0.01	-2.91
NetBox	239	0.01	225	0.01	5.26
OpenCms	236	0.01	241	0.01	-2.96
Unknown	224	0.00	214	0.00	3.72
Ultraseek	222	0.00	227	0.01	-3.09
DinaHTTPd	222	0.00	0	0.00	N/A
PWS	214	0.00	0	0.00	N/A
Orion	213	0.00	217	0.00	-2.73
WS	208	0.00	202	0.00	2.04

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.