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?

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	October 2017 Count	October 2017 %	September 2017 Count	September 2017 %	Growth %
Apache	2,556,977	46.69	2,552,685	46.82	-0.28
nginx	945,298	17.26	932,046	17.09	0.97
Microsoft-IIS	873,021	15.94	871,112	15.98	-0.23
null	398,674	7.28	390,681	7.17	1.59
Microsoft-HTTPAPI	227,631	4.16	228,670	4.19	-0.90
cloudflare-nginx	88,958	1.62	87,563	1.61	1.14
IdeaWebServer	51,161	0.93	51,029	0.94	-0.19
Apache-Coyote	47,255	0.86	47,762	0.88	-1.50
LiteSpeed	40,878	0.75	39,775	0.73	2.32
BigIP	24,645	0.45	24,124	0.44	1.71
openresty	16,715	0.31	16,607	0.30	0.20
AkamaiGHost	13,772	0.25	14,182	0.26	-3.32
Flywheel	9,869	0.18	9,615	0.18	2.19
Tengine	9,284	0.17	9,873	0.18	-6.38
CloudFront	9,148	0.17	9,907	0.18	-8.07
lighttpd	8,122	0.15	8,224	0.15	-1.68
WWW	6,558	0.12	6,445	0.12	1.30
wts	5,939	0.11	5,490	0.10	7.70
IIS	5,388	0.10	5,725	0.10	-6.31
squid	5,161	0.09	5,195	0.10	-1.10
Lotus-Domino	5,014	0.09	5,043	0.09	-1.02
AmazonS3	4,646	0.08	5,036	0.09	-8.15
Varnish	4,578	0.08	4,418	0.08	3.16
kangle	3,860	0.07	3,762	0.07	2.15
Safedog	3,692	0.07	4,304	0.08	-14.60
Cowboy	3,309	0.06	3,398	0.06	-3.05
sffe	3,069	0.06	3,325	0.06	-8.11
EZproxy	2,739	0.05	2,727	0.05	-0.01
nginx-reuseport	2,572	0.05	2,490	0.05	2.83
XtendWeb-nginx	2,027	0.04	1,999	0.04	0.95
nginx-upupw	1,870	0.03	2,349	0.04	-20.75
Resin	1,708	0.03	1,712	0.03	-0.68
Destiny	1,413	0.03	1,414	0.03	-0.52
IBM_HTTP_Server	1,389	0.03	1,424	0.03	-2.89
Zope	1,325	0.02	1,313	0.02	0.47
GlassFish	1,215	0.02	1,196	0.02	1.14
WDaemon	1,208	0.02	1,194	0.02	0.72
-	1,163	0.02	1,186	0.02	-2.38
IceWarp	1,161	0.02	1,145	0.02	0.95
GSYQ	1,151	0.02	860	0.02	33.24
Pantheon	1,129	0.02	1,553	0.03	-27.63
Caddy	1,090	0.02	1,032	0.02	5.15
Oracle-Application-Server-10g	1,019	0.02	1,032	0.02	-1.70
III	1,001	0.02	998	0.02	-0.15
ScreenConnect	967	0.02	946	0.02	1.77
ws-httpd	927	0.02	919	0.02	0.42
Rumpus	810	0.01	815	0.01	-1.06
Icecast	800	0.01	779	0.01	2.24
PWS	779	0.01	719	0.01	7.86
CHO	770	0.01	772	0.01	-0.70
Bomgar	756	0.01	751	0.01	0.22
Web	745	0.01	703	0.01	5.50
xServers	713	0.01	1,025	0.02	-30.75
Nginx	695	0.01	666	0.01	3.89
Oracle-Application-Server-11g	679	0.01	677	0.01	-0.15
YxlinkWAF	649	0.01	884	0.02	-26.91
ATS	646	0.01	655	0.01	-1.81
Server	615	0.01	637	0.01	-3.88
Cougar	615	0.01	625	0.01	-2.04
Protected	575	0.01	567	0.01	0.96
WebServer	565	0.01	542	0.01	3.78
WAF	551	0.01	544	0.01	0.84
thttpd	528	0.01	526	0.01	-0.07
EdgePrism	522	0.01	516	0.01	0.71
redir-httpd	498	0.01	499	0.01	-0.64
WowzaStreamingEngine	491	0.01	491	0.01	-0.44
httpd	483	0.01	483	0.01	-0.44
CommuniGatePro	470	0.01	473	0.01	-1.08
TWebAP	469	0.01	490	0.01	-4.71
Boa	458	0.01	475	0.01	-4.01
Pagely	457	0.01	444	0.01	2.47
Oracle	457	0.01	458	0.01	-0.66
AliyunOSS	447	0.01	449	0.01	-0.89
Firewall	446	0.01	429	0.01	3.50
yunjiasu-nginx	445	0.01	457	0.01	-3.06
WildFly	443	0.01	416	0.01	6.02
awselb	428	0.01	487	0.01	-12.51
QRATOR	423	0.01	398	0.01	5.81
GSHD	415	0.01	406	0.01	1.76
cc-web	413	0.01	404	0.01	1.77
SonicWALL	403	0.01	411	0.01	-2.38
VWebServer	402	0.01	435	0.01	-8.00
*****************	399	0.01	442	0.01	-10.13
Sun	391	0.01	392	0.01	-0.70
1	385	0.01	393	0.01	-2.47
Werkzeug	382	0.01	365	0.01	4.19
linuxOS	380	0.01	467	0.01	-18.99
ECAcc	374	0.01	345	0.01	7.92
LRBD-f544269	362	0.01	0	0.00	N/A
CentOS	357	0.01	331	0.01	7.38
Oracle-iPlanet-Web-Server	354	0.01	350	0.01	0.69
Sun-ONE-Web-Server	339	0.01	346	0.01	-2.46
gunicorn	338	0.01	327	0.01	2.90
Google	338	0.01	349	0.01	-3.58
OpenBSD	333	0.01	323	0.01	2.64
Abyss	326	0.01	324	0.01	0.17
ghs	324	0.01	342	0.01	-5.68
ECS	318	0.01	0	0.00	N/A
Footprint	314	0.01	0	0.00	N/A
Zeus	310	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.