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	December 1998 Count	December 1998 %	November 1998 Count	November 1998 %	Growth %
Apache	397,179	44.03	391,726	43.54	1.12
Microsoft-IIS	233,837	25.92	228,399	25.39	2.11
thttpd	52,404	5.81	55,500	6.17	-5.83
Netscape-Enterprise	45,056	4.99	45,082	5.01	-0.32
Rapidsite	24,126	2.67	26,196	2.91	-8.14
NCSA	20,872	2.31	21,306	2.37	-2.30
WebSitePro	16,246	1.80	16,496	1.83	-1.78
Stronghold	13,372	1.48	13,720	1.52	-2.79
Netscape-Communications	9,304	1.03	10,193	1.13	-8.96
Netscape-FastTrack	9,257	1.03	9,215	1.02	0.19
null	8,481	0.94	9,532	1.06	-11.26
Netscape-Commerce	7,846	0.87	7,814	0.87	0.14
CERN	6,312	0.70	6,409	0.71	-1.77
BESTWWWD	5,810	0.64	5,653	0.63	2.51
Lotus-Domino	5,644	0.63	5,296	0.59	6.29
WN	3,436	0.38	3,397	0.38	0.88
WebSTAR	3,221	0.36	3,353	0.37	-4.19
WebSite	2,497	0.28	2,634	0.29	-5.45
Novell-HTTP-Server	2,271	0.25	2,267	0.25	-0.09
NaviServer	2,110	0.23	2,099	0.23	0.26
Microsoft-Internet-Information-Server	1,827	0.20	0	0.00	N/A
Purveyor	1,520	0.17	1,702	0.19	-10.93
Apache-1.2.5	1,433	0.16	1,381	0.15	3.49
Commerce-Builder	1,392	0.15	1,453	0.16	-4.45
Roxen·Challenger	1,381	0.15	1,479	0.16	-6.87
HomeDoor	1,134	0.13	1,220	0.14	-7.29
Zeus	1,059	0.12	1,290	0.14	-18.12
OSU	943	0.10	948	0.11	-0.79
Open-Market-Secure-WebServer	894	0.10	874	0.10	2.02
MacHTTP	831	0.09	841	0.09	-1.45
Worldgroup	716	0.08	733	0.08	-2.58
QuidProQuo	702	0.08	691	0.08	1.32
Microsoft-PWS-95	665	0.07	692	0.08	-4.16
ApacheFP	656	0.07	632	0.07	3.52
Affinity-Apache	597	0.07	427	0.05	39.44
SWS-1.0	573	0.06	589	0.07	-2.97
Microsoft-PWS	560	0.06	578	0.06	-3.37
Domino-Go-Webserver	530	0.06	517	0.06	2.24
Lotus	453	0.05	499	0.06	-9.46
IBM-ICS	453	0.05	451	0.05	0.18
Apache-NeoWebScript	421	0.05	407	0.05	3.17
Mini-Proxy	417	0.05	491	0.05	-15.30
Oracle_Web_listener2.1	414	0.05	410	0.05	0.71
Alibaba	338	0.04	344	0.04	-2.00
Apache-SSL-US	331	0.04	292	0.03	13.06
NetUSE	322	0.04	300	0.03	7.05
JavaWebServer	306	0.03	284	0.03	7.46
AppleShareIP	299	0.03	254	0.03	17.41
OmniHTTPd	293	0.03	274	0.03	6.65
PowerWeb	290	0.03	287	0.03	0.78
FirstClass	288	0.03	275	0.03	4.45
Xitami	279	0.03	263	0.03	5.80
Roxen	267	0.03	256	0.03	4.02
Oracle_Web_listener3.0	256	0.03	254	0.03	0.52
ODN	251	0.03	287	0.03	-12.77
Oracle_Web_listener2.0	245	0.03	259	0.03	-5.65
FrontPage-PWS32	240	0.03	262	0.03	-8.64
ConcentricHost-Ashurbanipal	229	0.03	224	0.02	1.96
SAMBAR	225	0.02	240	0.03	-6.50
ApacheSSL	224	0.02	202	0.02	10.60
IBM-Secure-Export-ICS	198	0.02	200	0.02	-1.26
Spinner	195	0.02	194	0.02	0.25
EvilServer	183	0.02	205	0.02	-10.97
NetPresenz	179	0.02	175	0.02	2.02
IgServ	179	0.02	177	0.02	0.86
Oracle_Web_Listener_NT_2.1.0.3.1	176	0.02	171	0.02	2.65
Oracle_Web_listener3.0.1.0.0	172	0.02	179	0.02	-4.16
Oracle_Web_listener3.0.1	164	0.02	158	0.02	3.52
HouseIt	159	0.02	158	0.02	0.37
BorderWare	151	0.02	153	0.02	-1.57
IBM	148	0.02	163	0.02	-9.44
Oracle_Web_Listener	133	0.01	0	0.00	N/A
HTTP	129	0.01	131	0.01	-1.79
David-WebBox	126	0.01	126	0.01	-0.26
GoServe	123	0.01	126	0.01	-2.64
phttpd	119	0.01	177	0.02	-32.95
Rumpelstilzchen	119	0.01	121	0.01	-1.91
Oracle_Web_Listener_NT_2.1.1	116	0.01	153	0.02	-24.38
CommerceServer400	116	0.01	106	0.01	9.15
CONNECTnet[welp3]	116	0.01	105	0.01	10.18
FrontPage	114	0.01	132	0.01	-13.86
Ultraseek	107	0.01	99	0.01	7.80
Red	104	0.01	0	0.00	N/A
Apache-EUnet	103	0.01	102	0.01	0.71
Microsoft-ELG	102	0.01	138	0.02	-26.28
Imaker	98	0.01	99	0.01	-1.27
Netsite-Communications	94	0.01	95	0.01	-1.31
eShare-Expressions	92	0.01	88	0.01	4.27
Oracle_Web_listener3.0.2.0.0	90	0.01	0	0.00	N/A
IBM-ICS-AS400	90	0.01	88	0.01	2.00
web500gw	85	0.01	81	0.01	4.66
PHP	85	0.01	89	0.01	-4.75
IBM-Secure-Export-ICS-AS400	84	0.01	90	0.01	-6.91
WinHttpd	82	0.01	89	0.01	-8.11
IBM-Secure-ICS	81	0.01	77	0.01	4.92
GN	75	0.01	82	0.01	-8.78
Relocator	74	0.01	74	0.01	-0.26
IC-www	66	0.01	98	0.01	-32.83
Fnord	65	0.01	63	0.01	2.90
CFTnet	65	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.