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	Info	OS	Devicetype	Count	Percent
ssl	SSLv3					262252	86.027
http	nginx	1.0.6				9966	3.269
http						6009	1.971
no match						2769	0.908
http	SonicWALL				firewall	2382	0.781
chat	AIM or ICQ server					1960	0.643
ftp	vsftpd	2.0.8 or later				1853	0.608
ftp						1419	0.465
ftp	ProFTPD			Unix		1311	0.43
ftp	FileZilla ftpd		Mandatory SSL	Windows		805	0.264
ftp	FileZilla ftpd		IP blocked	Windows		784	0.257
ftp	Serv-U ftpd	11.0		Windows		754	0.247
ftp	Serv-U ftpd	11.2		Windows		588	0.193
ftp	Serv-U ftpd	10.5		Windows		569	0.187
ftp	Serv-U ftpd	12.0		Windows		557	0.183
ssl	Microsoft IIS SSL			Windows		437	0.143
ftp	Serv-U ftpd	11.1		Windows		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		Windows		365	0.12
ftp	Serv-U ftpd	10.2		Windows		350	0.115
ftp	Serv-U ftpd	8.0		Windows		317	0.104
http	lighttpd	1.4.29				308	0.101
ftp	Gene6 ftpd	3.10.0 build 2		Windows		259	0.085
ftp	Serv-U ftpd	10.0		Windows		257	0.084
ftp	Serv-U ftpd	9.4		Windows		246	0.081
ftp	Serv-U ftpd	10.4		Windows		192	0.063
ftp	Serv-U ftpd		SSL Required	Windows		184	0.06
ftp	Serv-U ftpd	9.3		Windows		182	0.06
ftp	Serv-U ftpd	7.3		Windows		179	0.059
ftp	Serv-U ftpd	10.3		Windows		173	0.057
ftp	ProFTPD	1.3.3c		Unix		173	0.057
ftp	Pure-FTPd					172	0.056
ftp	FileZilla ftpd	0.9.37 beta		Windows		136	0.045
ftp	FileZilla ftpd	0.9.40 beta		Windows		133	0.044
ftp	FileZilla ftpd	0.9.41 beta		Windows		130	0.043
ftp	Serv-U ftpd	7.2		Windows		125	0.041
http	Microsoft HTTPAPI httpd	2.0	SSDP/UPnP	Windows		116	0.038
http	Microsoft IIS httpd					115	0.038
http	GoAhead-Webs httpd					112	0.037
ftp	Serv-U ftpd	7.4		Windows		109	0.036
ftp	ProFTPD		requires SSL			107	0.035
http	Microsoft IIS httpd	6.0		Windows		103	0.034
ssl	TLS	1.0				96	0.031
ssh			protocol 1.5			92	0.03
ftp	vsftpd		Misconfigured	Unix		88	0.029
ftp	Serv-U ftpd	7.0		Windows		85	0.028
ftp	Serv-U ftpd	10.1		Windows		84	0.028
ftp	Microsoft ftpd			Windows		82	0.027
ftp	Serv-U ftpd	9.0		Windows		78	0.026
http	thttpd	2.24				71	0.023
ftp	Serv-U ftpd	8.2		Windows		70	0.023
ftp	ProFTPD	1.3.3d		Unix		67	0.022
ftp	Synology DiskStation NAS ftpd				storage-misc	65	0.021
ftp	Gene6 ftpd	3.9.0 build 2		Windows		64	0.021
ftp	FileZilla ftpd	0.9.39 beta		Windows		64	0.021
ftp	ProFTPD	1.3.4a		Unix		63	0.021
http	Apache Tomcat/Coyote JSP engine	1.1				61	0.02
ftp	ProFTPD	1.3.3a		Unix		60	0.02
ftp	vsftpd (before 2.0.8) or WU-FTPD					59	0.019
ftp	Serv-U ftpd	7.1		Windows		59	0.019
http	httpd					55	0.018
http	Netwave IP camera http config				webcam	54	0.018
ftp	ProFTPD	1.3.1		Unix		54	0.018
telnet						50	0.016
http	Avtech AVN801 network camera	1.0	UPnP 1.0		webcam	47	0.015
ftp	ProFTPD	1.3.2		Unix		47	0.015
ftp	Serv-U ftpd	9.1		Windows		43	0.014
ftp	Gene6 ftpd	3.6.0 build 23		Windows		41	0.013
http	lighttpd					38	0.012
ftp	Serv-U ftpd	9.2		Windows		38	0.012
ftp	ProFTPD	1.3.0		Unix		37	0.012
ftp	ProFTPD	1.3.3g		Unix		36	0.012
arcserve	ARCserve Discovery					34	0.011
http	Apache					33	0.011
vnc	VNC		protocol 3.8			32	0.01
http	PDR-M800	1.0				32	0.01
ftp	Serv-U ftpd	6.4		Windows		32	0.01
ftp	Gene6 ftpd	3.8.0 build 34		Windows		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
ssh			protocol 2.0			26	0.009
http	thttpd	2.25b				24	0.008
ssh	WeOnlyDo sshd	2.1.3	protocol 2.0	Windows		22	0.007
ssh	WeOnlyDo sshd	2.3.6.165	protocol 2.0	Windows		21	0.007
http-proxy	Squid http proxy	2.7.STABLE9				21	0.007
ftp	ProFTPD	1.3.3		Unix		21	0.007
ssh	OpenSSH	4.3	protocol 2.0			20	0.007
ftp	ProFTPD	1.3.2c		Unix		20	0.007
ftp	FileZilla ftpd	0.9.34 beta		Windows		20	0.007