Overview of services running on Port 50021 TCP.
~6 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
chat	AIM or ICQ server	1711	26.25
no match	-/-	1649	25.299
http	lighttpd	359	5.508
http		331	5.078
ftp		244	3.743
ftp	MikroTik router ftpd	174	2.67
ftp	vsftpd	171	2.624
ftp	ProFTPD	139	2.133
ftp	FileZilla ftpd	139	2.133
http	Microsoft IIS httpd	134	2.056
ftp	DrayTek Vigor 2820 ADSL router ftpd	125	1.918
ftp	Microsoft ftpd	124	1.902
http	Microsoft HTTPAPI httpd	113	1.734
ssh	OpenSSH	91	1.396
mongodb	MongoDB	86	1.319
ssh		81	1.243
http	thttpd	74	1.135
ftp	Pure-FTPd	61	0.936
vnc	VNC	55	0.844
ftp	Serv-U ftpd	54	0.828
telnet		48	0.736
http	WangWnagSimpleServer	32	0.491
ftp	Dreambox ftpd	24	0.368
http	Boa HTTPd	23	0.353
mysql	MySQL	22	0.338
http	nginx	21	0.322
ftp	Synology DiskStation NAS ftpd	20	0.307
ftp	oftpd	18	0.276
telnet	Linux telnetd	14	0.215
ssl	TLS	14	0.215
arcserve	ARCserve Discovery	14	0.215
http	Cisco IOS http config	13	0.199
ftp	ProFTPD or KnFTPD	13	0.199
smtp		12	0.184
http	Jetty	12	0.184