Overview of services running on Port 43 TCP.
~8 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
no match	-/-	3579	41.928
chat	AIM or ICQ server	1707	19.998
http	lighttpd	934	10.942
http		494	5.787
http	Microsoft IIS httpd	198	2.32
whois	gwhois	189	2.214
telnet	Linux telnetd	126	1.476
ssh	OpenSSH	119	1.394
http	Microsoft HTTPAPI httpd	96	1.125
irr	Merit Internet Routing Registry	95	1.113
ssh		94	1.101
ftp	Microsoft ftpd	88	1.031
telnet		71	0.832
vnc	VNC	52	0.609
http	thttpd	47	0.551
http	Boa HTTPd	44	0.515
ftp		26	0.305
mysql	MySQL	21	0.246
ftp	FileZilla ftpd	21	0.246
whois	Public Interest Registry whois server	20	0.234
irr	Merit Internet Routing Registry whoisd	19	0.223
http	nginx	19	0.223
ssh	Dropbear sshd	17	0.199
smtp	Microsoft ESMTP	16	0.187
directconnect	Direct Connect P2P	16	0.187
smtp	Postfix smtpd	15	0.176
ftp	ProFTPD	15	0.176
ssl	TLS	13	0.152
backdoor	OptixPro backdoor	13	0.152
ssh	SCS sshd	12	0.141
smtp		12	0.141
openvpn	OpenVPN	12	0.141
whois	rwhois	11	0.129
http	GeoVision GeoHttpServer for webcams	11	0.129
ftp	vsftpd (before 2.0.8) or WU-FTPD	11	0.129
ftp	Pure-FTPd	11	0.129
ssh	ICE_4_All backdoor sshd	10	0.117
smtp	Microsoft Exchange smtpd	10	0.117
http	Panasonic webcam http config	10	0.117