Overview of services running on Port 161 TCP.
~12 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	SonicWALL		3670	28.333
http			2557	19.741
chat	AIM or ICQ server		990	7.643
no match	-/-	-/-	895	6.91
http	AIM	1.0	660	5.095
http-proxy	CCProxy http proxy		450	3.474
http	lighttpd	1.4.19	402	3.104
smux	Linux SNMP multiplexer		281	2.169
http	Netwave IP camera http config		201	1.552
http	Apache	2.2.22	196	1.513
http	lighttpd	1.4.29	189	1.459
http	Microsoft IIS httpd	6.0	135	1.042
http	DrcomServer1.0		119	0.919
http	Apache Tomcat/Coyote JSP engine	1.1	106	0.818
ssh			79	0.61
http	GoAhead-Webs		77	0.594
http	Avtech AVN801 network camera	1.0	73	0.564
http	thttpd	2.24 26oct2003	70	0.54
http	Microsoft IIS httpd	7.5	67	0.517
http	mini_httpd	1.19 19dec2003	62	0.479
telnet			54	0.417
http	Apache		52	0.401
http	PDR-M800	1.0	39	0.301
http	Apache	2.2.3	39	0.301
http	uc-httpd	1.0.0	37	0.286
http	Boa HTTPd	0.94.14rc21	36	0.278
http	Apache	2.2.14	36	0.278
http	DD-WRT milli_httpd		35	0.27
http	thttpd	2.25b 29dec2003	29	0.224
http	Microsoft IIS httpd	7.0	26	0.201
http	Apache	2.2.16	25	0.193
http	thttpd		24	0.185
http	GoAhead-Webs embedded httpd		24	0.185
http	Cross Web Server		22	0.17
vnc	VNC		21	0.162
http	Microsoft IIS httpd		21	0.162
http	Apache	2.2.15	19	0.147
http	Microsoft IIS httpd	5.1	15	0.116
http	Hikvision-Webs		15	0.116
ftp	Microsoft ftpd		15	0.116
ftp			15	0.116