You are viewing an outdated report.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) 57,013,736 hostnames, but only 4,656,833 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	September 2011 Count	September 2011 %	August 2011 Count	August 2011 %	Growth %
Apache	2,763,726	59.35	2,740,302	59.27	0.14
Microsoft-IIS	1,005,814	21.60	1,007,659	21.79	-0.89
null	360,746	7.75	359,431	7.77	-0.35
nginx	148,461	3.19	140,859	3.05	4.65
Microsoft-HTTPAPI	57,655	1.24	54,926	1.19	4.22
Apache-Coyote	46,114	0.99	45,916	0.99	-0.28
Rapidsite	42,029	0.90	42,897	0.93	-2.72
IdeaWebServer	39,027	0.84	38,594	0.83	0.40
lighttpd	19,965	0.43	19,923	0.43	-0.50
LiteSpeed	16,500	0.35	15,990	0.35	2.45
A	15,786	0.34	15,937	0.34	-1.65
Lotus-Domino	11,260	0.24	11,360	0.25	-1.59
IBM_HTTP_Server	6,819	0.15	6,830	0.15	-0.87
BigIP	6,713	0.14	6,536	0.14	1.98
squid	5,349	0.11	5,118	0.11	3.77
Oracle-Application-Server-10g	3,880	0.08	3,939	0.09	-2.20
Zope	3,751	0.08	3,783	0.08	-1.55
Resin	3,241	0.07	3,252	0.07	-1.05
AkamaiGHost	2,661	0.06	2,576	0.06	2.56
Sun-ONE-Web-Server	2,449	0.05	2,496	0.05	-2.58
Zeus	2,436	0.05	2,522	0.05	-4.10
Cougar	2,289	0.05	2,338	0.05	-2.79
Netscape-Enterprise	2,166	0.05	2,234	0.05	-3.73
HTTPD	2,117	0.05	2,032	0.04	3.44
EZproxy	1,782	0.04	1,761	0.04	0.47
WDaemon	1,747	0.04	1,715	0.04	1.14
IceWarp	1,576	0.03	1,581	0.03	-1.03
GWS	1,448	0.03	1,461	0.03	-1.60
Apache-AdvancedExtranetServer	1,229	0.03	1,249	0.03	-2.30
Sun-Java-System-Web-Server	1,168	0.03	1,164	0.03	-0.37
III	1,166	0.03	1,158	0.03	-0.03
Web	1,133	0.02	1,126	0.02	-0.09
thttpd	1,117	0.02	1,147	0.02	-3.31
Cherokee	1,081	0.02	1,073	0.02	0.03
Boa	1,060	0.02	1,055	0.02	-0.24
-	1,053	0.02	1,045	0.02	0.05
Oracle	1,028	0.02	1,042	0.02	-2.05
apache	1,019	0.02	1,010	0.02	0.17
httpd	1,013	0.02	998	0.02	0.78
Jetty	954	0.02	988	0.02	-4.13
Varnish	935	0.02	849	0.02	9.35
CommuniGatePro	888	0.02	879	0.02	0.30
cpsrvd	865	0.02	876	0.02	-1.96
PowerSchool	815	0.02	869	0.02	-6.88
Sun	781	0.02	780	0.02	-0.58
WWW	767	0.02	741	0.02	2.77
WebServerX	765	0.02	789	0.02	-3.73
ListManagerWeb	761	0.02	794	0.02	-4.84
xServers	734	0.02	704	0.02	3.52
NOYB	733	0.02	757	0.02	-3.86
Nginx	722	0.02	722	0.02	-0.71
AnWeb	718	0.02	738	0.02	-3.40
Rumpus	700	0.02	703	0.02	-1.14
sffe	684	0.01	721	0.02	-5.81
Ipswitch-IMail	661	0.01	677	0.01	-3.06
IBM_HTTP_SERVER	626	0.01	686	0.01	-9.40
WebtoB	618	0.01	622	0.01	-1.35
Bomgar	588	0.01	575	0.01	1.53
4D_WebStar_D	574	0.01	572	0.01	-0.36
FileMakerPro	514	0.01	529	0.01	-3.53
redir-httpd	513	0.01	513	0.01	-0.71
WebSTAR	508	0.01	510	0.01	-1.10
CloudFront	475	0.01	260	0.01	81.39
BIG-IP	466	0.01	476	0.01	-2.80
DeleGate	453	0.01	464	0.01	-3.07
WebLogic	438	0.01	452	0.01	-3.79
Server	429	0.01	432	0.01	-1.40
WebServer	421	0.01	378	0.01	10.58
AOLserver	417	0.01	435	0.01	-4.82
FC	408	0.01	422	0.01	-4.01
Abyss	400	0.01	404	0.01	-1.70
GlassFish	380	0.01	348	0.01	8.42
WebSphere	378	0.01	375	0.01	0.08
WebSite	370	0.01	375	0.01	-2.04
Secured	368	0.01	368	0.01	-0.71
EdgePrism	366	0.01	362	0.01	0.39
WebSitePro	357	0.01	370	0.01	-4.20
JRun	341	0.01	346	0.01	-2.15
Indy	310	0.01	316	0.01	-2.60
SAP	307	0.01	307	0.01	-0.71
4D_WebSTAR_S	303	0.01	320	0.01	-5.99
Roxen	302	0.01	300	0.01	-0.05
DinaHTTPd	301	0.01	280	0.01	6.73
SW	300	0.01	306	0.01	-2.66
Power	292	0.01	299	0.01	-3.04
cloudflare-nginx	288	0.01	266	0.01	7.50
OpenCms	283	0.01	274	0.01	2.55
RomPager	281	0.01	255	0.01	9.41
""	261	0.01	275	0.01	-5.77
Unknown	250	0.01	245	0.01	1.31
SAMBAR	249	0.01	258	0.01	-4.18
IIS	248	0.01	254	0.01	-3.06
IIS6	243	0.01	243	0.01	-0.71
PHP-CGI	235	0.01	203	0.00	14.94
WS	229	0.00	226	0.00	0.61
NetBox	211	0.00	0	0.00	N/A
HTTP	211	0.00	214	0.00	-2.10
Apache2	208	0.00	0	0.00	N/A
WebSEAL	206	0.00	0	0.00	N/A
BarracudaHTTP	204	0.00	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.