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	Count	Percent
ssl	SSLv3	262252	86.027
http	nginx	9992	3.278
ftp	Serv-U ftpd	6113	2.005
http		6019	1.974
no match	-/-	2769	0.908
http	SonicWALL	2382	0.781
ftp	FileZilla ftpd	2176	0.714
ftp	ProFTPD	2091	0.686
chat	AIM or ICQ server	1960	0.643
ftp	vsftpd	1953	0.641
ftp		1419	0.465
http	lighttpd	745	0.244
ftp	Gene6 ftpd	445	0.146
ssl	Microsoft IIS SSL	437	0.143
ssl	TLSv1	401	0.132
http	AIM	375	0.123
http	Microsoft IIS httpd	244	0.08
ftp	WS FTPd	237	0.078
http	Apache	236	0.077
ftp	Pure-FTPd	178	0.058
ssh	OpenSSH	145	0.048
http	thttpd	133	0.044
ssh		118	0.039
http	Microsoft HTTPAPI httpd	116	0.038
http	GoAhead-Webs httpd	112	0.037
ssl	TLS	96	0.031
ftp	Microsoft ftpd	85	0.028
ftp	Synology DiskStation NAS ftpd	65	0.021
http-proxy	Squid http proxy	63	0.021
http	Apache Tomcat/Coyote JSP engine	63	0.021
ftp	vsftpd (before 2.0.8) or WU-FTPD	59	0.019
http	httpd	55	0.018
http	Netwave IP camera http config	54	0.018
telnet		50	0.016
ssh	WeOnlyDo sshd	48	0.016
http	Avtech AVN801 network camera	47	0.015
http	Boa HTTPd	45	0.015
vnc	VNC	44	0.014
arcserve	ARCserve Discovery	34	0.011
http	PDR-M800	32	0.01
ssh	CoreFTP sshd	31	0.01
http	FastReport Server	30	0.01
ssh	Bitvise WinSSHD	24	0.008
mysql	MySQL	22	0.007
ftp	zFTPServer	21	0.007
http	Hikvision-Webs	19	0.006
ssh	SrSshServer	18	0.006
mongodb	MongoDB	18	0.006
http	mini_httpd	18	0.006
http	uc-httpd	16	0.005
http	uTorrent WebUI	15	0.005
tcpwrapped	BSD TCP Wrappers	14	0.005
smtp		14	0.005
http	Cross Web Server	13	0.004
ftp	IBM OS/390 ftpd	13	0.004
http	HTTPD 1.0	12	0.004
http	GoAhead-Webs	12	0.004
http	GeoVision GeoHttpServer for webcams	12	0.004
ssh	WS_FTP sshd	11	0.004
smtp	Postfix smtpd	11	0.004
http	Mbedthis-Appweb	11	0.004
ftp	oftpd	11	0.004
vnc	RealVNC Personal	10	0.003
smtp	Microsoft Exchange smtpd	10	0.003
openvpn	OpenVPN	10	0.003
damewaremr	DameWare Mini Remote Control	10	0.003