Overview of services running on Port 1723 TCP.
~289 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
pptp	Point to Point Tunneling Protocol					249321	85.991
http						12802	4.415
no match						7814	2.695
irc	Dancer ircd					4038	1.393
http	SonicWALL				firewall	3893	1.343
telnet	Draytek Vigor ADSL router telnetd				broadband router	2619	0.903
chat	AIM or ICQ server					2303	0.794
ssl	SSLv3					1435	0.495
http	AIM	1.0				606	0.209
ssh	DrayTek Vigor 2820n ADSL router sshd	2.0	protocol 2.0		broadband router	462	0.159
http	Draytek Vigor ADSL router webadmin				broadband router	343	0.118
ssh	DrayTek Vigor 2820 ADSL router sshd	2.0	protocol 2.0		broadband router	223	0.077
http	WangWnagSimpleServer	1.0				209	0.072
http	lighttpd	1.4.29				172	0.059
http	Microsoft IIS httpd	6.0		Windows		149	0.051
openvpn	OpenVPN					140	0.048
http	uTorrent WebUI			Windows		123	0.042
http	GoAhead-Webs httpd					111	0.038
http	Microsoft HTTPAPI httpd	2.0	SSDP/UPnP	Windows		104	0.036
http	Microsoft IIS httpd					94	0.032
ssh			protocol 1.5			92	0.032
http	Apache Tomcat/Coyote JSP engine	1.1				84	0.029
http	Netwave IP camera http config				webcam	80	0.028
http	thttpd	2.24				72	0.025
http	Avtech AVN801 network camera	1.0	UPnP 1.0		webcam	70	0.024
http	lighttpd	1.4.28				67	0.023
telnet						58	0.02
http	PDR-M800	1.0				50	0.017
vnc	VNC		protocol 3.8			49	0.017
http	Apache					47	0.016
http	Boa HTTPd	0.94.14rc21				37	0.013
http	Apache		SSL-only mode			37	0.013
http-proxy	Squid http proxy	2.7.STABLE9				35	0.012
ftp	Microsoft ftpd			Windows		35	0.012
arcserve	ARCserve Discovery					35	0.012
http	mini_httpd	1.19 19dec2003				34	0.012
ftp	DrayTek Vigor router ftpd	1.0			router	33	0.011
http	GoAhead-Webs					30	0.01
nntp	INN nntpd		posting ok			28	0.01
http	Apache	2.2.3	(CentOS)			28	0.01
http	Microsoft IIS httpd	7.5		Windows		25	0.009
ftp	DrayTek Vigor 2820 ADSL router ftpd	1.0			broadband router	25	0.009
http	thttpd	2.25b				22	0.008
http	thttpd	2.24 26oct2003				21	0.007
http	Cisco IOS http config			IOS		20	0.007
http	Boa HTTPd	0.94.13				20	0.007