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	Count	Percent
pptp	Point to Point Tunneling Protocol	249321	85.986
http		12830	4.425
no match	-/-	7814	2.695
irc	Dancer ircd	4038	1.393
http	SonicWALL	3893	1.343
telnet	Draytek Vigor ADSL router telnetd	2619	0.903
chat	AIM or ICQ server	2303	0.794
ssl	SSLv3	1435	0.495
http	AIM	606	0.209
http	Apache	476	0.164
ssh	DrayTek Vigor 2820n ADSL router sshd	462	0.159
http	Draytek Vigor ADSL router webadmin	343	0.118
http	Microsoft IIS httpd	308	0.106
http	lighttpd	279	0.096
ssh	DrayTek Vigor 2820 ADSL router sshd	223	0.077
http	WangWnagSimpleServer	209	0.072
ssh	OpenSSH	191	0.066
http	thttpd	166	0.057
openvpn	OpenVPN	140	0.048
http	uTorrent WebUI	123	0.042
http	GoAhead-Webs httpd	112	0.039
http	Microsoft HTTPAPI httpd	104	0.036
ssh		95	0.033
http	Apache Tomcat/Coyote JSP engine	86	0.03
http	Netwave IP camera http config	80	0.028
http	Boa HTTPd	74	0.026
http	Avtech AVN801 network camera	70	0.024
http-proxy	Squid http proxy	66	0.023
vnc	VNC	59	0.02
telnet		58	0.02
http	PDR-M800	50	0.017
ftp	Microsoft ftpd	36	0.012
http	mini_httpd	35	0.012
arcserve	ARCserve Discovery	35	0.012
ftp	DrayTek Vigor router ftpd	33	0.011
http	GoAhead-Webs	31	0.011
nntp	INN nntpd	28	0.01
mysql	MySQL	27	0.009
ftp	DrayTek Vigor 2820 ADSL router ftpd	25	0.009
ssh	Dropbear sshd	22	0.008
http	nginx	20	0.007
http	Cisco IOS http config	20	0.007
smtp	Microsoft ESMTP	19	0.007
http	Mbedthis-Appweb	19	0.007
ftp	Serv-U ftpd	19	0.007
http	uc-httpd	17	0.006
ssh	WeOnlyDo sshd	16	0.006
http	Hikvision-Webs	15	0.005
ftp	vsftpd	15	0.005
ssl	TLS	14	0.005
ftp	ProFTPD	14	0.005
ftp	FileZilla ftpd	14	0.005
ftp		14	0.005
smtp	Microsoft Exchange smtpd	13	0.004
http	DVR Systems webcam http interface	13	0.004
http	Cross Web Server	13	0.004
ftp	Pure-FTPd	13	0.004
flexlm	FlexLM license manager	13	0.004
http	TeamViewer httpd	12	0.004
http-proxy	F5 BIG-IP load balancer http proxy	12	0.004
http	Gadspot/Avtech AV787 webcam http config	12	0.004
http	AIM HTTP	12	0.004
upnp	Portable SDK for UPnP devices	11	0.004
http	GeoVision GeoHttpServer for webcams	11	0.004
telnet	Linux telnetd	10	0.003
ssh	SCS sshd	10	0.003
http-proxy	MikroTik http proxy	10	0.003
http	MS-SDK-HttpServer	10	0.003
	jdoc	10	0.003