Overview of services running on Port 993 TCP.
~4.8 Million 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	4189034	87.319
ssl	TLSv1	538845	11.232
ssl/imap	Cyrus imapd	16126	0.336
psql	Pervasive.SQL Server - Relational Engine	11415	0.238
ssl	Microsoft IIS SSL	11226	0.234
no match	-/-	6970	0.145
ssl	TLS	3664	0.076
http	SonicWALL	3389	0.071
http		2981	0.062
chat	AIM or ICQ server	2573	0.054
imap	Microsoft Exchange imapd	2151	0.045
http	lighttpd	866	0.018
ssh	OpenSSH	709	0.015
imap	MailEnable imapd	557	0.012
http	Apache	385	0.008
http	Microsoft IIS httpd	340	0.007
http	AIM	338	0.007
imap	Dovecot imapd	294	0.006
imap		293	0.006
http	thttpd	286	0.006
imap	Courier Imapd	256	0.005
http	Microsoft HTTPAPI httpd	182	0.004
smtp	Microsoft Exchange smtpd	167	0.003
http	GoAhead-Webs httpd	167	0.003
openvpn	OpenVPN	157	0.003
imap	SmarterMail imapd	153	0.003
imap	hMailServer imapd	146	0.003
http-proxy	Squid http proxy	138	0.003
ssl	SSLv2	137	0.003
http	Boa HTTPd	122	0.003
http	DrcomServer1.0	117	0.002
tcpwrapped	BSD TCP Wrappers	111	0.002
http	Apache Tomcat/Coyote JSP engine	109	0.002
ssh		105	0.002
smtp		103	0.002
http	Secure Computing Sidewinder firewall http admin	91	0.002
vnc	VNC	90	0.002
http	Netwave IP camera http config	79	0.002
ssh	Dropbear sshd	73	0.002
http	CCProxy	71	0.001
http	Avtech AVN801 network camera	71	0.001
ssl	multi-vendor SSL	70	0.001
arcserve	ARCserve Discovery	70	0.001
http	Hikvision-Webs	67	0.001
smtp	Postfix smtpd	58	0.001
telnet		57	0.001
http	PDR-M800	56	0.001
pop3	MailEnable POP3 Server	53	0.001
imap	Microsoft Exchange 2007-2010 imapd	53	0.001
imap	Binc imapd	48	0.001
imap-proxy	nginx imap proxy	43	0.001
imap	Axigen imapd	42	0.001
smtp	Microsoft ESMTP	41	0.001
mysql	MySQL	40	0.001
http	mini_httpd	39	0.001
ftp	FileZilla ftpd	33	0.001
ftp	vsftpd	32	0.001
imap	Sun Java System Messaging Multiplexor imapd	31	0.001
http	nginx	31	0.001
ftp	Microsoft ftpd	31	0.001
imap	Cyrus imapd	30	0.001
imap	Microsoft Exchange Server 2003 imapd	27	0.001
ftp	ProFTPD	27	0.001
imap	UW imapd	26	0.001
ftp	WS FTPd	25	0.001
socks-proxy	CCProxy socks proxy	24	0.001
ftp		24	0.001
imap	Alt-N MDaemon imapd	22	0.0
http	uTorrent WebUI	21	0.0
http	Gadspot/Avtech AV787 webcam http config	21	0.0
ftp	Serv-U ftpd	21	0.0
pop3	Dovecot pop3d	19	0.0
http	uc-httpd	19	0.0
xml		18	0.0
vnc	RealVNC Enterprise	18	0.0
msdtc	Microsoft Distributed Transaction Coordinator	18	0.0
http	http server 1.0	18	0.0
http	Mbedthis-Appweb	16	0.0
vnc	RealVNC Personal	15	0.0
imap	Mailtraq imapd	15	0.0
http	Cross Web Server	15	0.0
ftp	Pure-FTPd	15	0.0
telnet	Allied Telesis x900-series switch telnetd	14	0.0
imap	Zimbra imapd	14	0.0
http-proxy	F5 BIG-IP load balancer http proxy	14	0.0
imap	Microsoft Exchange 2003 imapd	13	0.0
imap	Citadel imapd	13	0.0
http	DVR Systems webcam http interface	13	0.0
directconnect	Direct Connect P2P	13	0.0
imap	Arvixe imapd	12	0.0
http	Jetty	12	0.0
vnc		11	0.0
smtp	4D WebSTAR smtpd	11	0.0
http	GeoVision GeoHttpServer for webcams	11	0.0
http	AIM HTTP	11	0.0
ssh	SCS sshd	10	0.0
imap	Tobit David.fx imapd	10	0.0
http	GoAhead-Webs	10	0.0