Overview of services running on Port 60021 TCP.
~49 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
ftp	Netgear broadband router or ZyXel VoIP adapter ftpd	1.0				41488	83.117
no match						1812	3.63
chat	AIM or ICQ server					1757	3.52
ftp	ProFTPD	1.3.2		Unix		706	1.414
http	lighttpd	1.4.19				367	0.735
http						322	0.645
ftp						212	0.425
ftp	vsftpd	2.0.8 or later				148	0.297
ftp	MikroTik router ftpd	4.17			router	145	0.29
http	Microsoft IIS httpd					128	0.256
ftp	MikroTik router ftpd	5.14			router	122	0.244
ftp	vsftpd	2.0.7		Unix		120	0.24
ftp	vsftpd	2.0.5		Unix		114	0.228
ftp	MikroTik router ftpd	5.8			router	113	0.226
http	Microsoft HTTPAPI httpd	2.0	SSDP/UPnP	Windows		97	0.194
ssh			protocol 1.5			86	0.172
ftp	Microsoft ftpd			Windows		81	0.162
ftp	ProFTPD	1.3.1		Unix		77	0.154
http	Allegro-Software-RomPager	4.30b3				69	0.138
http	thttpd					68	0.136
telnet						67	0.134
ftp	Pure-FTPd					49	0.098
http	Cisco IOS http config			IOS		47	0.094
ftp	Serv-U ftpd	6.4		Windows		41	0.082
ftp	MikroTik router ftpd	5.17			router	41	0.082
ftp	ProFTPD	1.3.3		Unix		39	0.078
ftp	MikroTik router ftpd	2.9.42			router	39	0.078
vnc	VNC		protocol 3.8			36	0.072
ftp	MikroTik router ftpd	4.11			router	33	0.066
ftp	FileZilla ftpd	0.9.41 beta		Windows		31	0.062
ftp	vsftpd	2.2.2		Unix		29	0.058
http	Boa HTTPd	0.94.14rc21				27	0.054
http	Virata-EmWeb	5.3.0				26	0.052
ftp	MikroTik router ftpd	5.7			router	26	0.052
ftp	MikroTik router ftpd	3.30			router	26	0.052
ftp	MikroTik router ftpd	4.6			router	25	0.05
ftp	Dreambox ftpd			Linux	media device	25	0.05
ftp	ProFTPD	1.3.4a		Unix		24	0.048
ftp	FileZilla ftpd	0.9.37 beta		Windows		24	0.048
http	Ubicom	1.1				23	0.046
http	micro_httpd					23	0.046
ftp	ProFTPD	1.3.3a		Unix		21	0.042
ftp	MikroTik router ftpd	5.16			router	21	0.042
ftp	MikroTik router ftpd	3.10			router	21	0.042
ftp	oftpd			Unix		20	0.04
ftp	MikroTik router ftpd	5.18			router	20	0.04