Overview of services running on Port 990 TCP.
~304 Thousand IP addresses observed from May to December 2012
To get raw lists of the data go to Download. For an explanation of what this data is and how it was obtained, see Paper.

Servicename	Product	Version	Count	Percent
ssl	SSLv3		262252	86.027
http	nginx	1.0.6	9966	3.269
http			6019	1.974
no match	-/-	-/-	2769	0.908
http	SonicWALL		2382	0.781
chat	AIM or ICQ server		1960	0.643
ftp	vsftpd	2.0.8 or later	1853	0.608
ftp	FileZilla ftpd		1590	0.522
ftp	ProFTPD		1437	0.471
ftp			1419	0.465
ftp	Serv-U ftpd	11.0	754	0.247
ftp	Serv-U ftpd	11.2	588	0.193
ftp	Serv-U ftpd	10.5	569	0.187
ftp	Serv-U ftpd	12.0	557	0.183
ssl	Microsoft IIS SSL		437	0.143
ftp	Serv-U ftpd	11.1	420	0.138
ssl	TLSv1		401	0.132
http	lighttpd	1.4.19	385	0.126
http	AIM	1.0	375	0.123
ftp	Serv-U ftpd	11.3	365	0.12
ftp	Serv-U ftpd	10.2	350	0.115
ftp	Serv-U ftpd	8.0	317	0.104
http	lighttpd	1.4.29	308	0.101
ftp	Gene6 ftpd	3.10.0 build 2	259	0.085
ftp	Serv-U ftpd	10.0	257	0.084
ftp	Serv-U ftpd	9.4	246	0.081
ftp	Serv-U ftpd	10.4	192	0.063
ftp	Serv-U ftpd		184	0.06
ftp	Serv-U ftpd	9.3	182	0.06
ftp	Serv-U ftpd	7.3	179	0.059
ftp	Pure-FTPd		178	0.058
ftp	Serv-U ftpd	10.3	173	0.057
ftp	ProFTPD	1.3.3c	173	0.057
ftp	FileZilla ftpd	0.9.37 beta	136	0.045
ftp	FileZilla ftpd	0.9.40 beta	133	0.044
ftp	FileZilla ftpd	0.9.41 beta	130	0.043
ftp	Serv-U ftpd	7.2	125	0.041
ssh			118	0.039
http	Microsoft HTTPAPI httpd	2.0	116	0.038
http	Microsoft IIS httpd		115	0.038
http	GoAhead-Webs httpd		112	0.037
ftp	Serv-U ftpd	7.4	109	0.036
http	Microsoft IIS httpd	6.0	103	0.034
ssl	TLS	1.0	96	0.031
ftp	vsftpd		92	0.03
ftp	Serv-U ftpd	7.0	85	0.028
ftp	Serv-U ftpd	10.1	84	0.028
ftp	Microsoft ftpd		82	0.027
ftp	Serv-U ftpd	9.0	78	0.026
http	thttpd	2.24	71	0.023
ftp	Serv-U ftpd	8.2	70	0.023
ftp	ProFTPD	1.3.3d	67	0.022
ftp	Synology DiskStation NAS ftpd		65	0.021
ftp	Gene6 ftpd	3.9.0 build 2	64	0.021
ftp	FileZilla ftpd	0.9.39 beta	64	0.021
http	Apache Tomcat/Coyote JSP engine	1.1	63	0.021
ftp	ProFTPD	1.3.4a	63	0.021
ftp	ProFTPD	1.3.3a	60	0.02
ftp	vsftpd (before 2.0.8) or WU-FTPD		59	0.019
ftp	Serv-U ftpd	7.1	59	0.019
http	httpd		55	0.018
http	Netwave IP camera http config		54	0.018
ftp	ProFTPD	1.3.1	54	0.018
telnet			50	0.016
http	Apache		48	0.016
http	Avtech AVN801 network camera	1.0	47	0.015
ftp	ProFTPD	1.3.2	47	0.015
vnc	VNC		44	0.014
ftp	Serv-U ftpd	9.1	43	0.014
ftp	Gene6 ftpd	3.6.0 build 23	41	0.013
http	lighttpd		38	0.012
ftp	Serv-U ftpd	9.2	38	0.012
ftp	ProFTPD	1.3.0	37	0.012
ftp	ProFTPD	1.3.3g	36	0.012
arcserve	ARCserve Discovery		34	0.011
http	PDR-M800	1.0	32	0.01
ftp	Serv-U ftpd	6.4	32	0.01
ftp	Gene6 ftpd	3.8.0 build 34	32	0.01
http-proxy	Squid http proxy	2.6.STABLE12	31	0.01
http	FastReport Server		30	0.01
http	Boa HTTPd	0.94.14rc21	28	0.009
http	Apache	2.2.14	28	0.009
http	Apache	2.2.3	26	0.009
http	thttpd	2.25b	24	0.008
ssh	WeOnlyDo sshd	2.1.3	22	0.007
ssh	WeOnlyDo sshd	2.3.6.165	21	0.007
ssh	OpenSSH	4.3	21	0.007
http-proxy	Squid http proxy	2.7.STABLE9	21	0.007
ftp	ProFTPD	1.3.3	21	0.007
http	thttpd		20	0.007
http	Apache	2.2.22	20	0.007
ftp	ProFTPD	1.3.2c	20	0.007
ftp	FileZilla ftpd	0.9.34 beta	20	0.007
http	Hikvision-Webs		19	0.006
ftp	Serv-U ftpd	6.3	19	0.006
ssh	SrSshServer	1.00	18	0.006
ftp	Gene6 ftpd	3.5.0 build 10	17	0.006
http	uc-httpd	1.0.0	16	0.005
http	mini_httpd	1.19 19dec2003	16	0.005
ftp	FileZilla ftpd	0.9.31 beta	16	0.005
http	uTorrent WebUI		15	0.005