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	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	1.0	606	0.209
ssh	DrayTek Vigor 2820n ADSL router sshd	2.0	462	0.159
http	Draytek Vigor ADSL router webadmin		343	0.118
ssh	DrayTek Vigor 2820 ADSL router sshd	2.0	223	0.077
http	WangWnagSimpleServer	1.0	209	0.072
http	lighttpd	1.4.29	172	0.059
http	Microsoft IIS httpd	6.0	149	0.051
openvpn	OpenVPN		140	0.048
http	uTorrent WebUI		123	0.042
http	GoAhead-Webs httpd		112	0.039
http	Microsoft HTTPAPI httpd	2.0	104	0.036
ssh			95	0.033
http	Microsoft IIS httpd		94	0.032
http	Apache Tomcat/Coyote JSP engine	1.1	86	0.03
http	Apache		84	0.029
http	Netwave IP camera http config		80	0.028
http	thttpd	2.24	72	0.025
http	Avtech AVN801 network camera	1.0	70	0.024
http	Apache	2.2.16	70	0.024
http	lighttpd	1.4.28	67	0.023
vnc	VNC		59	0.02
telnet			58	0.02
http	Apache	2.2.3	51	0.018
http	PDR-M800	1.0	50	0.017
http	Apache	2.2.14	44	0.015
http	Apache	2.2.22	39	0.013
http	Boa HTTPd	0.94.14rc21	37	0.013
http-proxy	Squid http proxy	2.7.STABLE9	35	0.012
ftp	Microsoft ftpd		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	33	0.011
http	GoAhead-Webs		30	0.01
nntp	INN nntpd		28	0.01
http	Microsoft IIS httpd	7.5	25	0.009
ftp	DrayTek Vigor 2820 ADSL router ftpd	1.0	25	0.009
http	thttpd		23	0.008
http	thttpd	2.25b	22	0.008
http	thttpd	2.24 26oct2003	21	0.007
http	Cisco IOS http config		20	0.007
http	Boa HTTPd	0.94.13	20	0.007
ssh	OpenSSH	4.3	19	0.007
http	Mbedthis-Appweb	2.0.4	19	0.007
ssh	OpenSSH	5.1p1 Debian 5	17	0.006
http	uc-httpd	1.0.0	17	0.006
http-proxy	Squid http proxy	2.6.STABLE12	17	0.006
http	Microsoft IIS httpd	7.0	17	0.006
http	Apache	2.2.17	17	0.006
ssh	OpenSSH	5.5p1 Debian 6+squeeze2	16	0.006
http	Microsoft IIS httpd	5.1	15	0.005
http	lighttpd	1.4.20	15	0.005
http	Hikvision-Webs		15	0.005
http	Apache	2.2.9	15	0.005
http	Apache	2.2.21	15	0.005
http	Apache	2.2.15	15	0.005
http	Apache	1.3.28	15	0.005