Overview of services running on Port 6646 TCP.
~22 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
http			5341	23.433
irc	Dancer ircd		3894	17.084
http	SonicWALL		3670	16.101
chat	AIM or ICQ server		1921	8.428
telnet	Cisco telnetd		1576	6.914
no match	-/-	-/-	1102	4.835
http	AIM	1.0	646	2.834
telnet			563	2.47
ssl	SSLv3		486	2.132
http	lighttpd	1.4.29	432	1.895
http	lighttpd	1.4.19	428	1.878
http-proxy	Squid http proxy	2.7.STABLE9	385	1.689
http	Microsoft IIS httpd	6.0	127	0.557
ssh			96	0.421
http	Apache Tomcat/Coyote JSP engine	1.1	78	0.342
http	Netwave IP camera http config		70	0.307
http	mini_httpd	1.19 19dec2003	68	0.298
http	Microsoft HTTPAPI httpd	2.0	62	0.272
http	GoAhead-Webs httpd		62	0.272
http	Apache		62	0.272
http	PDR-M800	1.0	58	0.254
http	Avtech AVN801 network camera	1.0	55	0.241
http	GoAhead-Webs		52	0.228
vnc	VNC		47	0.206
http	thttpd	2.24	43	0.189
http	Microsoft IIS httpd		42	0.184
http	Apache	2.2.3	41	0.18
http	Apache	2.2.14	38	0.167
http	thttpd	2.24 26oct2003	34	0.149
http	Boa HTTPd	0.94.14rc21	30	0.132
ftp	Microsoft ftpd		26	0.114
http-proxy	Squid http proxy		25	0.11
http	Apache	2.2.22	25	0.11
http	Microsoft IIS httpd	7.5	24	0.105
http	Hikvision-Webs		21	0.092
http	uTorrent WebUI		20	0.088
http	Apache	2.2.16	19	0.083
http	Microsoft IIS httpd	7.0	18	0.079
http	Mbedthis-Appweb	2.0.4	17	0.075
http	Apache	1.3.28	17	0.075
http	uc-httpd	1.0.0	16	0.07
http	Microsoft IIS httpd	5.1	16	0.07
http	Apache	2.2.15	15	0.066