Overview of services running on Port 256 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
ssh	Dropbear sshd	0.51	5488	45.359
no match	-/-	-/-	1806	14.927
chat	AIM or ICQ server		1468	12.133
fw1-topology	Checkpoint FireWall-1 Topology		1401	11.579
http	lighttpd	1.4.19	380	3.141
http			323	2.67
http	Microsoft IIS httpd		161	1.331
fw1-secureremote	Checkpoint Firewall1 SecureRemote		136	1.124
http	Microsoft HTTPAPI httpd	2.0	109	0.901
ssh			94	0.777
telnet			47	0.388
ssh	OpenSSH	4.3	45	0.372
vnc	VNC		36	0.298
arcserve	ARCserve Discovery		31	0.256
http	Boa HTTPd	0.94.14rc21	30	0.248
ftp			29	0.24
http	MiniServ	1.580	20	0.165
ssh	MikroTik RouterOS sshd		18	0.149
ftp	vsftpd	2.3.5	17	0.141
ftp	Microsoft ftpd		17	0.141
ssh	OpenSSH	5.5p1 Debian 6+squeeze2	15	0.124