Overview of services running on Port 19 TCP.
~148 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
chargen						116884	78.534
http						9484	6.372
no match						8321	5.591
http	SonicWALL				firewall	3612	2.427
chat	AIM or ICQ server					2341	1.573
chargen	xinetd chargen			Unix		1064	0.715
chargen	Linux chargen			Linux		812	0.546
ssl	SSLv3					694	0.466
ftp	Microsoft ftpd			Windows		603	0.405
http	AIM	1.0				574	0.386
http	lighttpd	1.4.29				419	0.282
http	lighttpd	1.4.19				412	0.277
chargen	SunOS chargen			SunOS		328	0.22
chargen	Lantronix chargen	1.0				129	0.087
ssh	OpenSSH	5.5	protocol 2.0			128	0.086
http	Microsoft IIS httpd	6.0		Windows		118	0.079
http	GoAhead-Webs httpd					108	0.073
ftp						101	0.068
http	Microsoft IIS httpd					93	0.062
ssh			protocol 1.5			92	0.062
http	Microsoft HTTPAPI httpd	2.0	SSDP/UPnP	Windows		85	0.057
http	Apache Tomcat/Coyote JSP engine	1.1				75	0.05
http	Netwave IP camera http config				webcam	74	0.05
http	Avtech AVN801 network camera	1.0	UPnP 1.0		webcam	66	0.044
ssh	OpenSSH	4.3	protocol 2.0			63	0.042
telnet						55	0.037
http	PDR-M800	1.0				47	0.032
vnc	VNC		protocol 3.8			33	0.022
http	Boa HTTPd	0.94.14rc21				33	0.022
http	Apache					33	0.022
http-proxy	Squid http proxy	2.6.STABLE12				31	0.021
telnet	BSD-derived telnetd					29	0.019
ftp	vsftpd	2.0.8 or later				29	0.019
http	mini_httpd	1.19 19dec2003				28	0.019
ssh	OpenSSH	5.1p1 Debian 5	protocol 2.0	Linux		26	0.017
http-proxy	Squid http proxy	2.7.STABLE9				26	0.017
ftp	Pure-FTPd					24	0.016
http	Microsoft IIS httpd	7.5		Windows		23	0.015
http	Hikvision-Webs					23	0.015
http	thttpd	2.25b				22	0.015