Overview of services running on Port 8181 TCP.
~219 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
ssl	SSLv3		63375	28.822
http	Microsoft IIS httpd	6.0	32486	14.774
http			13742	6.25
http	Microsoft IIS httpd		11904	5.414
http	Sun GlassFish	2.1	9619	4.375
no match	-/-	-/-	5539	2.519
irc	Dancer ircd		4038	1.836
http	Apache Tomcat/Coyote JSP engine	1.1	3755	1.708
http	SonicWALL		3324	1.512
http	Ipswitch IMail Monitor web service	8.22	2915	1.326
http	Apache		2342	1.065
chat	AIM or ICQ server		2278	1.036
http	CTCFC	1.0	1979	0.9
http	Sun GlassFish	2.1.1	1760	0.8
http	DD-WRT milli_httpd		1733	0.788
http	Microsoft HTTPAPI httpd	2.0	1609	0.732
http	Apache	2.2.22	1338	0.608
http	MikroTik router config httpd		1279	0.582
http	Apache	2.2.3	1272	0.578
http	CherryPy httpd	3.2.0	1217	0.553
http	Allegro RomPager	4.51 UPnP/1.0	1202	0.547
http	Netwave IP camera http config		1084	0.493
http	Ipswitch IMail Monitor web service	8.05	1075	0.489
http	GoAhead-Webs httpd		1062	0.483
http	Secure Computing Sidewinder firewall http admin		1015	0.462
http	Boa HTTPd	0.94.14rc21	1005	0.457
http	Ipswitch IMail web service	8.15	1002	0.456
http	Transmission BitTorrent management httpd		972	0.442
http	GeoVision GeoHttpServer for webcams		917	0.417
http	Avtech AVN801 network camera	1.0	839	0.382
http	Virata-EmWeb	6.0.1	781	0.355
http	Apache	2.2.14	738	0.336
upnp	Conexant-EmWeb	6.1.0	723	0.329
http	lighttpd	1.4.28	642	0.292
http	Apache	2.2.16	639	0.291
http	AIM	1.0	630	0.287
http	uc-httpd	1.0.0	612	0.278
http	nginx		610	0.277
http	Cross Web Server		573	0.261
remoting	MS .NET Remoting services		550	0.25
http	MikroTik router http config		546	0.248
http	lighttpd	1.4.19	516	0.235
http	lighttpd	1.4.29	509	0.231
http	ise GmbH HTTP-Server v2.0		508	0.231
http	Apache	2.2.9	504	0.229
http	HTTPD 1.0		497	0.226
http	Draytek Vigor ADSL router webadmin		489	0.222
http	Sagem F@st router httpd		480	0.218
http	lighttpd	1.4.20	478	0.217
http	thttpd		465	0.211
http	mini_httpd	1.19 19dec2003	440	0.2
http	Intoto httpd	1.0	429	0.195
http	Hikvision-Webs		429	0.195
http	Boa HTTPd	0.93.15	424	0.193
http	lighttpd		411	0.187
http	Ipswitch IMail Monitor web service	8.15	381	0.173
http	Linksys router http config		370	0.168
http	Unknown	0.0 UPnP	347	0.158
http	D-Link DIR-300 WAP http admin		323	0.147
http	Apache	2.2.15	311	0.141
ssl	TLS	1.0	306	0.139
http	Apache	2.2.17	301	0.137
http	Boa HTTPd	0.94.13	296	0.135
http	Ipswitch IMail web service	8.22	289	0.131
http	nginx	1.2.0	271	0.123
http-proxy	Squid http proxy	2.6.STABLE21	262	0.119
http	webcamXP.Lite		253	0.115
http	uhttpd	1.0.0	252	0.115
http	Microsoft IIS httpd	7.5	252	0.115
http	Apache	1.3.36	251	0.114
http	WindWeb	2.0	243	0.111
http	Ipswitch IMail Monitor web service	7.07	239	0.109
http	Ipswitch IMail Monitor web service	8.12	233	0.106
http	Ipswitch IMail web service	8.05	232	0.106
http	Apache	2.2.8	232	0.106
http	Ipswitch IMail web service	7.15	227	0.103
http	Apache	2.2.21	223	0.101
xml-rpc	ABYSS httpd		207	0.094
http	thttpd	2.25b	207	0.094
http-proxy	Symantec firewall http proxy		202	0.092
http	lighttpd	1.4.30	202	0.092
http	Indy httpd	8.1.2.1759	201	0.091
http	GoAhead-Webs embedded httpd		199	0.091
http	Allegro RomPager	4.07 UPnP/1.0	196	0.089
http	Netgear DG834G router http config		195	0.089
http	Ipswitch IMail Monitor web service	8.03	185	0.084
http-proxy	Oops! http proxy		184	0.084
http	uTorrent utserver web interface		179	0.081
http	eWON		179	0.081
http	Ipswitch IMail Monitor web service	12.5	177	0.08
http	SonicWALL firewall http config		176	0.08
http	Apache	1.3.33	175	0.08
http	QNAP TS-219P NAS http config	1.0	174	0.079
http	http server 1.0		171	0.078
http	Mbedthis-Appweb	2.0.4	170	0.077
http	Router		165	0.075
http	lighttpd	1.4.26	162	0.074
http	Apache	2.2.11	159	0.072
http	Netgear DG834 router http config		156	0.071
http	Jetty	6.1.x	149	0.068
http	Gadspot/Avtech AV787 webcam http config		146	0.066
http	Microsoft IIS httpd	5.0	143	0.065
telnet			142	0.065
http	DVR Systems webcam http interface		141	0.064
http	TP-LINK Router		136	0.062
http	Ipswitch IMail Monitor web service	8.21	133	0.06
http	HTTP Software 1.1		127	0.058
http	SBox server		126	0.057
http	Apache	0.6.5	126	0.057
http-proxy	Haproxy http proxy		124	0.056
http	Apache	2.0.59	121	0.055
http	Microsoft IIS httpd	7.0	116	0.053
http	Boa HTTPd	0.94.11	115	0.052
arcserve	ARCserve Discovery		114	0.052
http	DrcomServer1.0		112	0.051
http	Ipswitch IMail Monitor web service	8.00	111	0.05
http	IP_SHARER WEB	1.0	111	0.05
http	Microsoft IIS httpd	5.1	109	0.05
http	Jetty	8.0.y.z-SNAPSHOT	107	0.049
http	EfangVHost Server		106	0.048
http	PDR-M800	1.0	105	0.048
http	Ipswitch IMail Monitor web service	7.13	105	0.048
http	Apache	2	105	0.048
http-proxy	MikroTik http proxy		103	0.047
http-proxy	Squid http proxy		101	0.046
http	OpenDNS Guide		101	0.046
http	Apache	1.3.42	100	0.045
http	Httpd	1.0	98	0.045
http	H3C-Miniware-Webs		98	0.045
vnc	VNC		96	0.044
ssh			96	0.044
http	Apache	2.0.52	95	0.043
http	Apache	2.0.63	90	0.041
xml			88	0.04
http	MiniWeb		87	0.04
http	Microsoft ISA httpd		87	0.04
http	Ipswitch IMail Monitor web service	8.20	87	0.04
http	Apache	2.0.48	87	0.04
upnp	Microsoft Windows UPnP		86	0.039
http	NcWebServer/1.3.37 (Unix) mod_ssl/2.8.28 OpenSSL	NcWebServer/1.3.37 (Unix) mod_ssl/2.8.28 OpenSSL	85	0.039
http	Netgear WGR614v9 WAP http config		83	0.038
http	Apache	2.2.20	83	0.038
http	lighttpd	1.4.23	82	0.037
http	Ipswitch IMail Monitor web service	7.15	82	0.037
intermapper	InterMapper network monitor		81	0.037
http	thttpd	2.25b 29dec2003	81	0.037
http	Netgear DGN1000 router http config		81	0.037
http	TwistedWeb httpd	8.2.0	77	0.035
http	Apache	2.0.55	77	0.035
http	Apache	1.3.41	77	0.035
http	D-Link/Airlink IP webcam http config	1.0	75	0.034
http	Oracle XML DB Enterprise Edition httpd		74	0.034
http	Apache	2.2.4	74	0.034
ssl	Microsoft IIS SSL		72	0.033
http	uTorrent WebUI		71	0.032
http	Apache	2.2.0	71	0.032
http	Apache	2.2.6	70	0.032
http	TP-LINK WR340G WAP http config		69	0.031
http	dcs-lig-httpd		69	0.031
ssl	TLSv1		68	0.031
http	Apache	2.2.19	68	0.031
http	MS-SDK-HttpServer	1.0	67	0.03
http	Ipswitch IMail Monitor web service	6.06	67	0.03
http	NAI EPO Agent framework		66	0.03
http	httpd 1.1		65	0.03
http	Netgear or Linksys WAP http config		64	0.029
http	Router Webserver		62	0.028
http	Ipswitch IMail Monitor web service	8.01	62	0.028
http	Digital Loggers Web Power Switch II http config		62	0.028
http	Apache	2.0.53	62	0.028
http	Embedded HTTP Server		60	0.027
http	Waveplus HTTPD		59	0.027
http	siyou server		59	0.027
http	Ipswitch IMail Monitor web service	8.13	59	0.027
http	Gnway Web Server		58	0.026
http	RapidLogic httpd	1.1	57	0.026
http	Netgear FVS318 router http config		55	0.025
http	MiniServ	0.01	54	0.025
http	Jetty	7.5.4.v20111024	54	0.025
http	Indy	8.0.22	54	0.025
http	Boa httpd		54	0.025
ssh	OpenSSH	4.3	53	0.024
http	httpd		53	0.024
http	Apache	1.3.20	53	0.024
http	D-Link DCS-900 webcam http config		52	0.024
http	Ubicom httpd	1.1	50	0.023
http	Jetty	7.3.0.v20110203	50	0.023
http	Cisco IOS http config		50	0.023
http	webserver	1.0	49	0.022
http	Netgear WGR614v7 WAP http config		49	0.022
http	Jetty	6.1.25	49	0.022
http	TP-LINK WR740N WAP http config		48	0.022
http	thttpd	2.20c 21nov01	48	0.022
http	Apache	2.2.13	48	0.022
ftp	Microsoft ftpd		48	0.022
shoutcast	SHOUTcast server	1.9.8	47	0.021
http-proxy	Squid http proxy	3.0.STABLE25	47	0.021
http-proxy	Squid http proxy	2.7.STABLE9	47	0.021
http	Milestone XProtect video surveillance http interface		47	0.021
http	Jetty		47	0.021
http	HTTPServer		47	0.021
http	Dreambox httpd		46	0.021
http	Apache	1.3.28	46	0.021
http	WYM httpd	1.0	45	0.02
http	Netgear DG834GT router http config		45	0.02
http	Apache Tomcat/Coyote JSP engine	1.0	45	0.02
http	Tridium Niagara httpd	1.1	43	0.02
http	Netgear WNR3500L WAP http config		43	0.02
http	TRENDnet TV-IP100 or TV-IP110 webcam display httpd		42	0.019
http	Microsoft-HTTPAPI	1.0	42	0.019
http	Ipswitch IMail Monitor web service	8.10	42	0.019
http	SAP Message Server httpd	release 700	41	0.019
http	Apache	2.2.12	41	0.019
http	Linksys PAP2 VoIP http config		40	0.018
http	Imagine Reloaded beta		40	0.018
http	FVG318		40	0.018
http	Apache	2.2.10	40	0.018
socks-proxy	Socks4A		39	0.018
http	GM Streaming Server httpd		39	0.018
http	Buffalo AirStation http config		39	0.018
http	nginx	0.8.54	38	0.017
http	Netgear WNR2000v2 WAP http config		38	0.017
http	BaseHTTPServer	0.3	38	0.017
http	Avamar		38	0.017
http	WebServer(IPCamera_Logo)		37	0.017
http	Ubicom	1.1	37	0.017
http	Techno Vision Security System http config	2.0	37	0.017
http-proxy	Squid http proxy	3.1.19	37	0.017
http	BenQ projector		37	0.017
rtsp	Avtech MPEG4 DVR control rtspd		36	0.016
http	Webs		36	0.016
http	Lotus Domino httpd		36	0.016
http	Jetty	6.0.2	36	0.016
http	Apache	2.0.64	36	0.016
http	Airlink 101 or TRENDnet TVIP-422w webcam http config		36	0.016
http	webcamXP httpd	5	35	0.016
http	nginx	1.0.5	35	0.016
http	Netgear WNR1000v3 WAP http config		35	0.016
shoutcast-publishing	SHOUTcast publishing port		34	0.015
http	TRENDnet TV-IP110w or TV-IP422W webcam display httpd		34	0.015
http	QNAP TS-109-II NAS http config	1.0	34	0.015
http	Microsoft Windows Media Server	9.01.01.5001	34	0.015
http	Jetty	6.1.26	34	0.015
http	ChipPC Extreme httpd		34	0.015
http	Boa HTTPd	0.94.14rc18	34	0.015
http	World Client WDaemon httpd	4.0	33	0.015
http	lighttpd	1.4.13	33	0.015
http	TP-LINK WR841N WAP http config		32	0.015
http	RWAPM X-Server 32bit Apache	2.2.10 (Win32) PHP	32	0.015
http	Ipswitch IMail Monitor web service	8.02	32	0.015
http	TP-LINK WR941N WAP http config		31	0.014
http	Fnord httpd	1.9	31	0.014
http	ADTRAN		31	0.014
http	ADH-Web httpd		31	0.014
http	Jetty	null (Windows 2003 5.2 x86)	30	0.014
http	Ipswitch IMail Monitor web service	5.05	30	0.014
http	Ipswitch IMail Monitor web service	4.10	30	0.014
http	D-Link DI-524 http config		30	0.014
http	Boa HTTPd	0.92o	30	0.014
rtsp			29	0.013
http	thttpd	2.19-MX Jul 1 2010	29	0.013
http	PasteWSGIServer	0.5	28	0.013
http	OwnServer1.0		28	0.013
http	IceWarp webmail httpd	8.3	28	0.013
http	HP Integrated Lights-Out http config		28	0.013
http	D-Link DI-804HV http config		28	0.013
http	Citrix Metaframe ICA Browser		28	0.013
http	WEB SERVER		27	0.012
http	TP-LINK WR541G/542G WAP http config		27	0.012
http-proxy	3Proxy http proxy		27	0.012
http	NEC Electra Elite IPK II WebPro		27	0.012
http	Microsoft HTTPAPI httpd	1.0	27	0.012
http	GoAhead-Webs		27	0.012
ssl	multi-vendor SSL		26	0.012
irc	Unreal ircd		26	0.012
http	nginx	0.7.67	26	0.012
http	nginx	0.7.65	26	0.012
http	Ipswitch IMail Monitor web service	4.07	26	0.012
http	Grandstream HT502 VoIP router http config		26	0.012
http	D-Link router/Airlink NAS http config		26	0.012
http	D-Link DCS-920 webcam http config		26	0.012
http	XBMC Web Media Manager		25	0.011
http	Winstone Servlet Engine	0.9.10	25	0.011
http	WebFS httpd	1.21	25	0.011
http	uClinux-httpd	0.2.2	25	0.011
http	nginx	0.8.44	25	0.011
http	Mobotix Camera http config		25	0.011
http	linux		25	0.011
http	Kerio MailServer http config		25	0.011
http	Jetty	7.4.5.v20110725	25	0.011
http	Jetty	7.4.5.fuse20111017	25	0.011
ftp			25	0.011
http	Sun GlassFish Open Source Edition	3.1.1	24	0.011
http	Netgear DGN2000 router http config		24	0.011
http	IP_SHARER WEB 1.0		24	0.011
http	Tornado		23	0.01
http	Speedr	0.8.0	23	0.01
ftp	vsftpd	2.0.8 or later	23	0.01
http	uhttpd	uhttpd	22	0.01
http	Switch		22	0.01
http	Network Camera		22	0.01
http	Netgear DG834PN router http config		22	0.01
http	Netgear DG834 FR WAP http config		22	0.01
http	MultView WEB Server V1.1		22	0.01
http	HttpFileServer httpd	2.2f	22	0.01
http	ESET NOD32 anti-virus update httpd		22	0.01
http	DrayTek Vigor 3300 router http config		22	0.01
http	Delta Networks Embedded HTTPD	1.00	22	0.01
http	David WebBox httpd	11.00a.0717	22	0.01
http	Boa HTTPd	0.94.14rc18-ipcam	22	0.01
http	Apache	1.3.27	22	0.01
http	antid		22	0.01
http	Allegro RomPager	4.03	22	0.01
http	Virgin Super Hub media player http config		21	0.01
http	Netgear CVG834G cable modem http config		21	0.01
http	Mono-HTTPAPI	1.0	21	0.01
http	LuCI Lua http config		21	0.01
http	D-Link DCS-910 webcam http config		21	0.01
vnc	RealVNC Personal		20	0.009
http	Zimbra http config		20	0.009
http	VMware ESXi Server httpd		20	0.009
http	Seagate Black Armor 440 NAS http config		20	0.009
http	Netgear DG834 http config		20	0.009
http	Mbedthis-Appweb	2.4.2	20	0.009
http	lighttpd	1.4.18	20	0.009
http	Indy	9.0.11	20	0.009
http	GoldStar iPECS 50B PBX http config		20	0.009
http	CherryPy httpd	3.1.2	20	0.009
http	CCcam card sharing system http config		20	0.009
http	Apache	2.4.1	20	0.009
http	Apache	2.3.8	20	0.009
http	Vivotek 3102 Camera http config		19	0.009
http	NT	5.0 UPnP	19	0.009
http	NewCS satellite card sharing system http config		19	0.009
http	Linksys RVS4000 security router http config		19	0.009
http	Jetty	6.1.8	19	0.009
http	Jetty	6.1.19	19	0.009
http	Jetty	5.1.2	19	0.009
http	BaseHTTPServer	0.2	19	0.009
vnc	RealVNC Enterprise		18	0.008
smtp	Postfix smtpd		18	0.008
http	UltiDev Cassini httpd	2.1.4.3	18	0.008
http	SmarterTools httpd	2.0.4562.18624	18	0.008
http-proxy	NetApp NetCache http proxy	6.0.5P1	18	0.008
http-proxy	Microsoft Foundation Class httpd	1.0	18	0.008
http	nginx	1.0.11	18	0.008
http	Netgear WNR3500 WAP http config		18	0.008
http	Netgear WGR614v6 WAP http config		18	0.008
http	MiniServ	1.580	18	0.008
http	Microsoft IIS		18	0.008
http	Jetty	7.x.y-SNAPSHOT	18	0.008
http	Jetty	6.1.5	18	0.008
http	Icecast streaming media server		18	0.008
http	Henry httpd	1.1	18	0.008
http	Engine 12.6.1.370		18	0.008
http	Embedded HTTP Server.		18	0.008
http	CrushFTP httpd		18	0.008
http	CherryPy httpd	3.2.0rc1	18	0.008
http	World Client WDaemon httpd	3.0	17	0.008
http	W3MFC	1.68	17	0.008
http	VCS-VideoJet-Webserver		17	0.008
http	thttpd	2.19-MX Oct 19 2011	17	0.008
http	Sun GlassFish Open Source Edition	3.1	17	0.008
http	Siemens Gigaset A580 or S450 VoIP phone http config		17	0.008
http	Sagem Livebox WAP http config		17	0.008
http	Netgear DG632 router http config		17	0.008
http	Microsoft-HTTPAPI	2.0	17	0.008
http	Jetty	6.1.14	17	0.008
http	GoAhead httpd		17	0.008
http	David WebBox httpd	11.00a.0636	17	0.008
http	Apache	2.0.54	17	0.008
http	Apache	1.3.34	17	0.008
http	Apache	1.3.29	17	0.008
http	VBrick DME v1.0		16	0.007
http	Tridium Niagara httpd	3.5.34	16	0.007
http	thttpd	2.25b-lxc 29dec2003	16	0.007
http	thttpd	2.19-MX Apr 26 2011	16	0.007
http	Sun GlassFish Open Source Edition	3.0.1	16	0.007
http-proxy	FreeProxy http proxy	4.50	16	0.007
http-proxy	F5 BIG-IP load balancer http proxy		16	0.007
http	Power MOD by emits.eu		16	0.007
http	nginx	1.0.0	16	0.007
http	Maipu-Webs		16	0.007
http	HomeSeer Home Control Web Interface		16	0.007
http	David-WebBox	12.00a (0781) WIN32	16	0.007
http	APC SmartUPS http config		16	0.007
http	Apache	6.6.6	16	0.007
secure-socket	CA Secure Socket Adapter		15	0.007
http	WebLogic httpd		15	0.007
http	thttpd	2.05p 09nov99	15	0.007
http	TeamViewer httpd		15	0.007
http	Oracle GlassFish	3.1.2	15	0.007
http	nginx	1.2.1	15	0.007
http	Miktotik Dude network monitor		15	0.007
http	lighttpd	1.4.31	15	0.007
http	JuanNiu	11.12.20	15	0.007
http	JuanNiu	11.07.26	15	0.007
http	Jetty	6.1.6	15	0.007
http	Indy	10.0.52	15	0.007
http	D-Link DIR-600 WAP http config	2.10	15	0.007
http	Apache	2.0.40	15	0.007
ftp	Pure-FTPd		15	0.007