Overview of services running on Port 1981 TCP.
~20 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	Info	OS	Devicetype	Count	Percent
no match						13589	65.578
irc	Dancer ircd					2720	13.126
chat	AIM or ICQ server					978	4.72
irc-proxy	psyBNC	2.3.2-9				299	1.443
http	lighttpd	1.4.19				272	1.313
ssh	OpenSSH	4.3	protocol 2.0			232	1.12
dominoconsole	Lotus Domino Console			25		226	1.091
http						215	1.038
dominoconsole	Lotus Domino Console			20		196	0.946
dominoconsole	Lotus Domino Console			50		142	0.685
http	WangWnagSimpleServer	1.0				136	0.656
irc-proxy	psyBNC	2.3.2-7				124	0.598
http	Microsoft IIS httpd					124	0.598
telnet						92	0.444
http	Microsoft HTTPAPI httpd	2.0	SSDP/UPnP	Windows		86	0.415
dominoconsole	Lotus Domino Console			00		79	0.381
ssh			protocol 1.5			63	0.304
dominoconsole	Lotus Domino Console			40		60	0.29
dominoconsole	Lotus Domino Console			16		54	0.261
dominoconsole	Lotus Domino Console			24		53	0.256
dominoconsole	Lotus Domino Console			48		50	0.241
ftp						38	0.183
dominoconsole	Lotus Domino Console			26		31	0.15
vnc	VNC		protocol 3.8			30	0.145
ssh	OpenSSH	5.3	protocol 2.0			28	0.135
ssh	OpenSSH	5.1p1 Debian 5	protocol 2.0	Linux		28	0.135
ssh	OpenSSH	5.5p1 Debian 6+squeeze2	protocol 2.0	Linux		26	0.125
dominoconsole	Lotus Domino Console			56		22	0.106
dominoconsole	Lotus Domino Console			35		22	0.106
ssh	OpenSSH	5.3p1 Debian 3ubuntu7	Ubuntu Linux; protocol 2.0	Linux		21	0.101
ftp	Microsoft ftpd			Windows		21	0.101
arcserve	ARCserve Discovery					20	0.097