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	Count	Percent
exec		5035	39.086
no match	-/-	1864	14.47
chat	AIM or ICQ server	1590	12.343
exec	AIX rexecd	1207	9.37
exec	HP-UX rexecd	605	4.696
exec	netkit-rsh rexecd	411	3.19
ssh	OpenSSH	385	2.989
http	lighttpd	358	2.779
http		292	2.267
http	Microsoft IIS httpd	152	1.18
ssh		147	1.141
secure-socket	CA Secure Socket Adapter	112	0.869
http	Microsoft HTTPAPI httpd	84	0.652
login	Cisco/NetApp logind	72	0.559
exec	OpenVMS execd	44	0.342
telnet		42	0.326
vnc	VNC	36	0.279
arcserve	ARCserve Discovery	35	0.272
ftp		27	0.21
tcpwrapped	BSD TCP Wrappers	22	0.171
http	Boa HTTPd	22	0.171
ftp	Microsoft ftpd	21	0.163
http	nginx	20	0.155
mysql	MySQL	19	0.147
directconnect	Direct Connect P2P	16	0.124
ftp	FileZilla ftpd	15	0.116
ftp	ProFTPD	14	0.109
ssl	TLS	10	0.078
domain	ISC BIND	10	0.078