Overview of services running on Port 6661 TCP.
~18 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
irc	Dancer ircd	4039	22.123
no match	-/-	2970	16.268
chat	AIM or ICQ server	2155	11.804
telnet	Cisco telnetd	2005	10.982
irc	Unreal ircd	1382	7.57
irc	InspIRCd	815	4.464
telnet		711	3.894
http	lighttpd	643	3.522
http		539	2.952
http	Microsoft IIS httpd	234	1.282
ssh	OpenSSH	160	0.876
http	Microsoft HTTPAPI httpd	160	0.876
http	thttpd	128	0.701
http	GoAhead-Webs httpd	118	0.646
ssh		98	0.537
http	Boa HTTPd	88	0.482
vnc	VNC	78	0.427
http	Apache Tomcat/Coyote JSP engine	66	0.362
http	Apache	66	0.362
http-proxy	Squid http proxy	53	0.29
socks5		51	0.279
irc		47	0.257
irc	ircu ircd	46	0.252
irc	IRCnet ircd	37	0.203
mysql	MySQL	34	0.186
ftp	Microsoft ftpd	29	0.159
irc	ratbox ircd	24	0.131
ftp	FileZilla ftpd	23	0.126
arcserve	ARCserve Discovery	23	0.126
http	nginx	22	0.121
http	Hikvision-Webs	21	0.115
ftp		19	0.104
vnc	RealVNC Enterprise	18	0.099
ftp	ProFTPD	18	0.099
vnc		16	0.088
http	http server 1.0	16	0.088
ftp	vsftpd	16	0.088
upnp	Microsoft Windows UPnP	15	0.082
smtp	Microsoft ESMTP	15	0.082
ftp	Pure-FTPd	15	0.082
http-proxy	F5 BIG-IP load balancer http proxy	13	0.071
ssh	Dropbear sshd	12	0.066
smtp		12	0.066
shoutcast-publishing	SHOUTcast publishing port	12	0.066
http	Jetty	12	0.066
vnc	RealVNC Personal	11	0.06
telnet	Allied Telesis x900-series switch telnetd	11	0.06
smtp	Microsoft Exchange smtpd	11	0.06
http	WYM httpd	11	0.06
telnet	EPIX Your Worldwide Internet Access	10	0.055
ssl	TLS	10	0.055
openvpn	OpenVPN	10	0.055
irc-proxy	psyBNC	10	0.055
http	GeoVision GeoHttpServer for webcams	10	0.055
ftp	vsftpd (before 2.0.8) or WU-FTPD	10	0.055
ftp	Serv-U ftpd	10	0.055