You are viewing an outdated report. The latest version of this report was published on October 1st, 2024

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) 61,796,142 hostnames, but only 4,686,056 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 2021 Count	April 2021 %	March 2021 Count	March 2021 %	Growth %
Apache	1,918,430	40.94	1,927,023	41.03	-0.23
nginx	1,262,995	26.95	1,253,432	26.69	0.98
Microsoft-IIS	431,431	9.21	442,144	9.42	-2.21
null	343,031	7.32	337,570	7.19	1.83
Microsoft-HTTPAPI	184,451	3.94	185,898	3.96	-0.57
cloudflare	101,451	2.16	101,808	2.17	-0.14
LiteSpeed	74,284	1.59	73,153	1.56	1.76
Nginx	58,245	1.24	56,047	1.19	4.14
IdeaWebServer	39,319	0.84	39,589	0.84	-0.47
BigIP	29,175	0.62	29,334	0.62	-0.33
awselb	26,474	0.56	25,482	0.54	4.11
openresty	20,983	0.45	25,650	0.55	-18.02
Tengine	20,064	0.43	20,916	0.45	-3.87
Apache-Coyote	18,397	0.39	18,903	0.40	-2.47
AkamaiGHost	17,471	0.37	18,557	0.40	-5.65
AmazonS3	14,855	0.32	14,469	0.31	2.89
CloudFront	7,873	0.17	8,503	0.18	-7.21
Flywheel	6,532	0.14	6,548	0.14	-0.03
nginx-rc	5,802	0.12	5,523	0.12	5.28
wts	4,999	0.11	4,762	0.10	5.20
nginx-reuseport	4,165	0.09	4,157	0.09	0.41
lighttpd	4,015	0.09	4,076	0.09	-1.29
Varnish	3,994	0.09	4,029	0.09	-0.66
Caddy	3,293	0.07	3,226	0.07	2.29
Lotus-Domino	2,512	0.05	2,536	0.05	-0.74
EZproxy	2,499	0.05	2,508	0.05	-0.15
Microsoft-Azure-Application-Gateway	1,701	0.04	1,596	0.03	6.81
Safedog	1,546	0.03	1,469	0.03	5.47
WWW	1,517	0.03	1,531	0.03	-0.70
Server	1,297	0.03	1,337	0.03	-2.78
Firewall	1,147	0.02	1,350	0.03	-14.86
ws-httpd	1,120	0.02	1,127	0.02	-0.41
Cowboy	1,115	0.02	1,136	0.02	-1.64
AliyunOSS	1,097	0.02	1,074	0.02	2.36
scl	1,081	0.02	1,104	0.02	-1.87
squid	1,072	0.02	1,073	0.02	0.12
kangle	996	0.02	1,117	0.02	-10.64
Icecast	971	0.02	891	0.02	9.21
VWebServer	852	0.02	866	0.02	-1.41
IIS	847	0.02	903	0.02	-6.00
IceWarp	800	0.02	800	0.02	0.21
ddos-guard	779	0.02	761	0.02	2.58
uvicorn	725	0.02	910	0.02	-20.16
o2switch-PowerBoost-v3	677	0.01	665	0.01	2.02
WDaemon	652	0.01	681	0.01	-4.05
Destiny	648	0.01	649	0.01	0.06
Kestrel	626	0.01	627	0.01	0.05
Resin	588	0.01	623	0.01	-5.42
GlassFish	578	0.01	588	0.01	-1.49
ScreenConnect	540	0.01	551	0.01	-1.79
Prometheus	535	0.01	542	0.01	-1.08
sffe	507	0.01	463	0.01	9.74
Zope	507	0.01	518	0.01	-1.91
CHO	494	0.01	505	0.01	-1.97
OpenBSD	481	0.01	476	0.01	1.27
redir-httpd	480	0.01	482	0.01	-0.20
ATS	479	0.01	485	0.01	-1.03
aruba-proxy	469	0.01	460	0.01	2.17
-	458	0.01	496	0.01	-7.46
QRATOR	454	0.01	449	0.01	1.33
Swan	424	0.01	0	0.00	N/A
Web	414	0.01	405	0.01	2.44
ECAcc	408	0.01	408	0.01	0.21
Oracle-Application-Server-10g	405	0.01	414	0.01	-1.97
cloudflare-nginx	389	0.01	374	0.01	4.23
Rumpus	380	0.01	391	0.01	-2.61
******	363	0.01	346	0.01	5.14
IBM_HTTP_Server	352	0.01	366	0.01	-3.62
elb	346	0.01	330	0.01	5.07
UploadServer	336	0.01	330	0.01	2.04
cc-web	331	0.01	326	0.01	1.75
ghs	323	0.01	326	0.01	-0.71
LRBD-85ce592	320	0.01	320	0.01	0.21
ddosx	317	0.01	311	0.01	2.15
WildFly	310	0.01	322	0.01	-3.52
eClass	307	0.01	305	0.01	0.87
E2EE	306	0.01	306	0.01	0.21
Netscape-Enterprise	303	0.01	296	0.01	2.58
4D	303	0.01	301	0.01	0.88
web	299	0.01	318	0.01	-5.77
envoy	297	0.01	274	0.01	8.63
EdgePrism	293	0.01	323	0.01	-9.09
CommuniGatePro	288	0.01	288	0.01	0.21
III	284	0.01	291	0.01	-2.20
CentOS	284	0.01	298	0.01	-4.49
WVS	283	0.01	267	0.01	6.22
nginx-upupw	281	0.01	291	0.01	-3.23
MageStack-MagentoOS	281	0.01	287	0.01	-1.88
shield	276	0.01	271	0.01	2.06
WAF	269	0.01	251	0.01	7.40
Werkzeug	263	0.01	265	0.01	-0.54
WowzaStreamingEngine	262	0.01	269	0.01	-2.39
bfe	257	0.01	253	0.01	1.80
awex	253	0.01	254	0.01	-0.18
Windows-Azure-Blob	251	0.01	0	0.00	N/A
kittenx	245	0.01	251	0.01	-2.18
none	243	0.01	262	0.01	-7.05
ECS	243	0.01	245	0.01	-0.60
YxlinkWAF	240	0.01	275	0.01	-12.54
istio-envoy	238	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.