Overview of services running on Port 512 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	Info	OS	Devicetype	Count	Percent
exec						5035	39.086
no match						1864	14.47
chat	AIM or ICQ server					1590	12.343
exec	AIX rexecd			AIX		1202	9.331
exec	HP-UX rexecd			HP-UX		605	4.696
exec	netkit-rsh rexecd			Linux		411	3.19
http	lighttpd	1.4.19				358	2.779
http						291	2.259
http	Microsoft IIS httpd					152	1.18
secure-socket	CA Secure Socket Adapter					112	0.869
ssh			protocol 1.5			87	0.675
http	Microsoft HTTPAPI httpd	2.0	SSDP/UPnP	Windows		84	0.652
login	Cisco/NetApp logind					72	0.559
ssh	OpenSSH	5.5	protocol 2.0			63	0.489
ssh			protocol 2.0			60	0.466
exec	OpenVMS execd			OpenVMS		44	0.342
ssh	OpenSSH	5.3p1 Debian 3ubuntu7	Ubuntu Linux; protocol 2.0	Linux		43	0.334
telnet						41	0.318
ssh	OpenSSH	5.9p1 Debian 5ubuntu1	Ubuntu Linux; protocol 2.0	Linux		40	0.311
arcserve	ARCserve Discovery					35	0.272
ssh	OpenSSH	4.3	protocol 2.0			28	0.217
ftp						27	0.21
vnc	VNC		protocol 3.8			24	0.186
tcpwrapped	BSD TCP Wrappers		rexecd			22	0.171
http	Boa HTTPd	0.94.14rc21				21	0.163
ssh	OpenSSH	5.0	protocol 2.0			20	0.155
ftp	Microsoft ftpd			Windows		20	0.155