Overview of services running on Port 591 TCP.
~14 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
http			3676	24.741
http	SonicWALL		3545	23.859
chat	AIM or ICQ server		1559	10.493
no match	-/-	-/-	935	6.293
http	AIM	1.0	671	4.516
http	FileMaker Web Publishing httpd		560	3.769
http	lighttpd	1.4.19	380	2.558
http	lighttpd	1.4.29	256	1.723
http	Microsoft IIS httpd	6.0	189	1.272
http	Network Associates ePolicy Orchestrator		149	1.003
http	DrcomServer1.0		110	0.74
http	Apache Tomcat/Coyote JSP engine	1.1	93	0.626
http	WebCompanion httpd 6.0v1		92	0.619
http	Netwave IP camera http config		88	0.592
ssh			87	0.586
http	FileMakerPro httpd	4.0	82	0.552
http	GoAhead-Webs		81	0.545
http	thttpd	2.24 26oct2003	78	0.525
http	Microsoft IIS httpd	7.5	74	0.498
http	Avtech AVN801 network camera	1.0	70	0.471
http	WebCompanion httpd 6.0v3		69	0.464
http	Apache		67	0.451
http	FileMakerPro httpd	5.0	58	0.39
http	PDR-M800	1.0	50	0.337
http	Microsoft IIS httpd	7.0	47	0.316
http	Apache	2.2.3	46	0.31
telnet			42	0.283
smtp			42	0.283
http	Apache	2.2.14	41	0.276
vnc	VNC		40	0.269
http	mini_httpd	1.19 19dec2003	37	0.249
http	Boa HTTPd	0.94.14rc21	35	0.236
http	Apache	2.2.22	35	0.236
http	Apache	2.2.21	30	0.202
http	WebCompanion httpd 6.0Jv1		28	0.188
http	thttpd	2.25b 29dec2003	27	0.182
http	Microsoft IIS httpd		26	0.175
http	Hikvision-Webs		26	0.175
http	uc-httpd	1.0.0	24	0.162
ftp	Microsoft ftpd		22	0.148
http	thttpd		21	0.141
http	Apache	2.2.17	21	0.141
http	WebCompanion httpd 5.5v3		20	0.135
http	Mbedthis-Appweb	2.0.4	20	0.135
http	Apache	2.2.16	20	0.135
http	Gadspot/Avtech AV787 webcam http config		19	0.128
http	Microsoft IIS httpd	5.1	17	0.114
http	Cross Web Server		17	0.114
http	Apache	2.2.9	17	0.114
http	uTorrent WebUI		16	0.108
http	WebCompanion httpd 5.5v4		15	0.101
http	Apache	2.2.8	15	0.101
http	Apache	2.0.53	15	0.101
directconnect	Direct Connect P2P		15	0.101