Overview of services running on Port 1998 TCP.
~26 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			9678	36.143
irc	Dancer ircd		4036	15.073
http	SonicWALL		3713	13.866
chat	AIM or ICQ server		2174	8.119
no match	-/-	-/-	1446	5.4
ssl	SSLv3		868	3.242
http	AIM	1.0	607	2.267
http	lighttpd	1.4.29	418	1.561
http	lighttpd	1.4.19	413	1.542
http	WangWnagSimpleServer	1.0	314	1.173
http	Microsoft IIS httpd	6.0	160	0.598
http	GoAhead-Webs httpd		114	0.426
http	Microsoft IIS httpd		113	0.422
ssh			96	0.359
http	Microsoft HTTPAPI httpd	2.0	96	0.359
http	Apache Tomcat/Coyote JSP engine	1.1	91	0.34
http	Netwave IP camera http config		87	0.325
http	Ipswitch IMail web service	8.15	67	0.25
http	thttpd	2.24	64	0.239
http	Avtech AVN801 network camera	1.0	64	0.239
http	Apache		57	0.213
telnet			54	0.202
http	PDR-M800	1.0	52	0.194
vnc	VNC		51	0.19
http	Boa HTTPd	0.94.14rc21	41	0.153
http	Apache	2.2.3	40	0.149
http	Apache	2.2.14	39	0.146
http	Jetty	8.0.y.z-SNAPSHOT	38	0.142
arcserve	ARCserve Discovery		34	0.127
http	mini_httpd	1.19 19dec2003	28	0.105
ftp	Microsoft ftpd		28	0.105
nntp	INN nntpd		27	0.101
http	Apache	2.2.22	25	0.093
http	Router		24	0.09
http-proxy	Squid http proxy	2.7.STABLE9	24	0.09
http	Apache	2.2.16	24	0.09
http	thttpd	2.25b	23	0.086
http	thttpd	2.24 26oct2003	23	0.086
http	uTorrent WebUI		22	0.082
http	thttpd		22	0.082
http	Jetty	4.2.x	22	0.082
http	Hikvision-Webs		21	0.078
remoting	MS .NET Remoting services		19	0.071
upnp	Portable SDK for UPnP devices	1.3.1	18	0.067
http	Mbedthis-Appweb	2.0.4	18	0.067
http	GeoVision GeoHttpServer for webcams		18	0.067
http	uc-httpd	1.0.0	17	0.063
ftp			17	0.063
http-proxy	Squid http proxy	2.6.STABLE12	16	0.06
http	GoAhead-Webs		16	0.06
http	Microsoft IIS httpd	5.1	15	0.056
http	DVR Systems webcam http interface		15	0.056
http	Apache	1.3.28	15	0.056