Overview of services running on Port 3128 TCP.
~664 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	Info	OS	Devicetype	Count	Percent
http-proxy	Squid http proxy	2.6.STABLE21				98966	14.897
no match						63913	9.62
http-proxy	Squid http proxy	2.7.STABLE3				59894	9.015
http-proxy	Squid http proxy	3.1.11-20110321				35851	5.396
http-proxy	Squid http proxy	2.7.STABLE9				35315	5.316
http						33760	5.082
http-proxy	Squid http proxy					29223	4.399
http	Apache					25255	3.801
http	Apache	2.0.52	(Red Hat)			16814	2.531
http-proxy	Squid http proxy	3.1.19				14353	2.16
http	Microsoft IIS httpd	5.0		Windows		13295	2.001
http-proxy	Squid http proxy	3.1.9				13048	1.964
http-proxy	Squid http proxy	3.1.10				13034	1.962
http-proxy	Squid http proxy	3.1.6				12465	1.876
http	Apache	2.0.63				8751	1.317
http-proxy	Squid http proxy	2.7.STABLE7				8532	1.284
http	Apache (Linux)					8506	1.28
http	Apache	2.2.3	(CentOS)			7680	1.156
http	GoAhead-Webs httpd					6978	1.05
http-proxy	Squid http proxy	2.7.STABLE6				5669	0.853
http-proxy	Squid http proxy	3.1.18				5472	0.824
http	Microsoft IIS httpd	5.1		Windows		5252	0.791
http-proxy	MikroTik http proxy					4921	0.741
http-proxy	Squid http proxy	2.7.STABLE5				4784	0.72
http-proxy	BlueCoat http proxy					4700	0.707
http-proxy	Squid http proxy	3.1.8				4572	0.688
http	alphapd					4448	0.67
irc	Dancer ircd					4095	0.616
http	SonicWALL				firewall	3952	0.595
http	Secure Computing Sidewinder firewall http admin				firewall	3791	0.571
http	GoAhead-Webs embedded httpd					3762	0.566
http-proxy	3Proxy http proxy					3609	0.543
http-proxy	Squid http proxy	2.7.STABLE2				3317	0.499
http	alphapd		DCS-932L			3312	0.499
http-proxy	Squid http proxy	3.0.STABLE19				3236	0.487
http-proxy	Squid http proxy	3.1.20				3003	0.452
http-proxy	Squid http proxy	2.5.STABLE14				2999	0.451
http	wanduck					2944	0.443
http	dcs-lig-httpd					2729	0.411
chat	AIM or ICQ server					2582	0.389
http-proxy	Squid http proxy	3.0.STABLE8				2484	0.374
http-proxy	Squid http proxy	2.6.STABLE18				2360	0.355
http-proxy	Squid http proxy	3.1.16				2354	0.354
http-proxy	Squid http proxy	3.1.4				2313	0.348
http-proxy	Squid http proxy	3.1.14				2225	0.335
http	alphapd		DCS-930L			2151	0.324
http-proxy	3proxy http proxy		authentication required			1821	0.274
http	Urchin RSS aggregator					1767	0.266
http-proxy	Squid http proxy	3.1.11				1767	0.266
http-proxy	Squid http proxy	3.0.STABLE10				1746	0.263
http-proxy	Squid http proxy	3.1.21				1740	0.262
http-proxy	Squid http proxy	2.6.STABLE16				1658	0.25
http-proxy	Squid http proxy	3.0.STABLE25				1605	0.242
http-proxy	Squid http proxy	3.2.0.13				1428	0.215
http-proxy	Squid http proxy	2.7.STABLE8				1337	0.201
http	lighttpd					1325	0.199
http-proxy	Squid http proxy	2.5.STABLE12				1254	0.189
http	Apache	2.2.14	(Unix)			1126	0.169
http-proxy	Squid http proxy	2.5.STABLE11				1108	0.167
http-proxy	Squid http proxy	2.5.STABLE9				1090	0.164
http-proxy	Squid http proxy	3.0.STABLE26				971	0.146
http	Tiny redirect server					851	0.128
http	UserGate http report area			Windows		818	0.123
http-proxy	Squid http proxy	2.5.STABLE6				737	0.111
http-proxy	Squid http proxy	3.2.1-20121001-r11668				719	0.108
http	thttpd	2.25b				709	0.107
http-proxy	Squid http proxy	3.0.STABLE18				708	0.107
http-proxy	Squid http proxy	3.0.STABLE1				676	0.102
http	AIM	1.0				662	0.1
http-proxy	Squid http proxy	3.1.12.2				653	0.098
http-proxy	Squid http proxy	3.0.STABLE20				645	0.097
http-proxy	Squid http proxy	2.4.STABLE7				621	0.093
http-proxy	Squid http proxy	3.2.3				507	0.076
http	Apache	2.0.46	(CentOS)			505	0.076
http-proxy	Squid http proxy	3.1.19-20120523-r10446				494	0.074
http	lighttpd	1.4.19				474	0.071
http-proxy	Squid http proxy	2.5.STABLE10				469	0.071
http-proxy	Squid http proxy	2.6.STABLE13				468	0.07
http	lighttpd	1.4.29				465	0.07
http-proxy	Squid http proxy	3.0.STABLE13				463	0.07
http-proxy	Squid http proxy	2.6.STABLE22				461	0.069
http-proxy	Squid http proxy	3.1.12				444	0.067
http-proxy	Squid http proxy	2.6.STABLE14				434	0.065
http			SmallProxy Authentication Required			431	0.065
http-proxy	Squid http proxy		Portuguese			403	0.061
socks-proxy	Socks4A					401	0.06
http-proxy	Squid http proxy	2.7.STABLE4				382	0.057
http-proxy	Squid http proxy	2.5.STABLE13				368	0.055
http-proxy	Squid http proxy	3.2.0.17				367	0.055
http-proxy	Squid http proxy	2.6.STABLE17				366	0.055
http-proxy	Squid http proxy	2.5.STABLE1				366	0.055
http-proxy	Squid http proxy	3.1.15				359	0.054
http-proxy	WinRoute http proxy			Windows		353	0.053
http-proxy	Oops! http proxy					350	0.053
http-proxy	Squid http proxy	2.5.STABLE5				349	0.053
http	WangWnagSimpleServer	1.0				340	0.051
http	nginx	1.2.1				319	0.048
http-proxy	NetApp NetCache http proxy	6.0.7				300	0.045
http-proxy	DansGuardian HTTP proxy					295	0.044
http-proxy	Squid http proxy	2.5.STABLE3				285	0.043
http-proxy	Squid http proxy	3.2.0.16				280	0.042
http-proxy	Squid http proxy	2.4.STABLE6				275	0.041
http	TreeNeWS httpd	0.0.1	3Com WX2200 WAP http config		WAP	255	0.038
http-proxy	Squid http proxy	2.6.STABLE12				247	0.037
http-proxy	Squid http proxy	3.2.0.7				242	0.036
http-proxy	Squid http proxy	3.0.STABLE15				238	0.036
http	thttpd	2.25b 29dec2003				235	0.035
http-proxy	Squid http proxy	2.6.STABLE20				229	0.034
http-proxy	EZproxy web proxy					228	0.034
http	Microsoft IIS httpd					226	0.034
http	DrcomServer1.0					213	0.032
http-proxy	Squid http proxy	3.2.0.12				209	0.031
http-proxy	Squid http proxy	3.2.0.19				208	0.031
http	CCProxy					208	0.031
http-proxy	Squid http proxy	2.6.STABLE23				204	0.031
http-proxy	Kerio Control http proxy					195	0.029
http-proxy	3proxy http proxy					193	0.029
http	Microsoft IIS httpd	6.0		Windows		193	0.029
http	Microsoft HTTPAPI httpd	2.0	SSDP/UPnP	Windows		192	0.029
http	Avtech AVN801 network camera	1.0	UPnP 1.0		webcam	192	0.029
http	GeoVision GeoHttpServer for webcams				webcam	187	0.028
http	Apache Tomcat/Coyote JSP engine	1.1				186	0.028
http	nginx	1.2.4				184	0.028
http-proxy	Squid http proxy	3.1.19-20120514-r10446				183	0.028
http-proxy	Squid http proxy	2.6.STABLE19				178	0.027
http-proxy	CCProxy http proxy		unauthorized	Windows		169	0.025
http-proxy	Squid http proxy	3.1.3				164	0.025
http-proxy	Squid http proxy	2.5.STABLE4				154	0.023
http-proxy	Squid http proxy	3.1.0.14				153	0.023
http	Netwave IP camera http config				webcam	152	0.023
http	Apache	2.2.8	(Ubuntu) PHP/5.2.4-2ubuntu5.24 with Suhosin-Patch			152	0.023
http	TBS	R2 UPnP				143	0.022
http-proxy	Squid http proxy	3.2.1				137	0.021
http	NCSA	1.4				137	0.021
http-proxy	Squid http proxy	2.7.STABLE9+fix2831+2833				134	0.02
http-proxy	Squid http proxy	3.0.STABLE7				127	0.019
http-proxy	Squid http proxy	2.5.STABLE7				126	0.019
http-proxy	Oops! http proxy		Authentication Required			124	0.019
http	Boa HTTPd	0.94.14rc21				123	0.019
http	Ubuntu	lucid UPnP				113	0.017
http-proxy	Squid http proxy		Spanish			112	0.017
http-proxy	Squid http proxy	3.0.STABLE9				112	0.017
http-proxy	MikroTik HttpProxy				router	112	0.017
http	thttpd	2.24 26oct2003				111	0.017
http-proxy	Tinyproxy	1.6.0				110	0.017
http-proxy	CCProxy http proxy			Windows		110	0.017
http	mini_httpd	1.19 19dec2003				109	0.016
http	uc-httpd	1.0.0				102	0.015
ssh			protocol 1.5			101	0.015
http	MikroTik router config httpd			RouterOS	router	101	0.015
http	HandyCache	HandyCache	HandyCache			101	0.015
http-proxy	Tinyproxy	1.8.2				99	0.015
http-proxy	Squid http proxy	3.0.PRE5				98	0.015
http-proxy	Squid http proxy	2.4.STABLE1				98	0.015
http	GoAhead-Webs httpd		Ovislink WAP http config		WAP	98	0.015
http-proxy	Tinyproxy	1.8.3				97	0.015
http-proxy	Squid http proxy	3.1.1				96	0.014
http-proxy	AVM KEN! http proxy					93	0.014
upnp	Portable SDK for UPnP devices	1.3.1	Linux 2.6.21; UPnP 1.0	Linux		92	0.014
http	Microsoft IIS httpd	7.5		Windows		91	0.014
http	Hikvision-Webs					89	0.013
http	AppWork GmbH HttpServer					89	0.013
http-proxy	Squid http proxy	3.0.STABLE16				86	0.013
http-proxy	Tinyproxy	1.6.4				85	0.013
http	WORLDWLAN PREMIUM Edition Server by XCONY					83	0.012
http-proxy	Squid http proxy	3.0.STABLE5				83	0.012
http	nginx					83	0.012
http-proxy	Squid http proxy	3.1.0.6				80	0.012
http-proxy	Squid http proxy	3.0.STABLE2				80	0.012
http	Squid	2.4.STABLE3				79	0.012
http-proxy	Tinyproxy	1.6.3				79	0.012
vnc	VNC		protocol 3.8			77	0.012
http-proxy	Squid http proxy	3.0.STABLE24				75	0.011
http	Apache	2.2.16	(Debian)			74	0.011
ssh	OpenSSH	4.3	protocol 2.0			73	0.011
http	thttpd					73	0.011
http-proxy	JanaServer http proxy	2.5.1.189		Windows		73	0.011
http	Apache	2.2.17	(Unix) DAV/2			73	0.011
telnet						71	0.011
http-proxy	Squid http proxy	2.3.STABLE4				70	0.011
http	Allegro RomPager	4.51 UPnP/1.0	ZyXEL ZyWALL 2			70	0.011
http	uTorrent WebUI			Windows		66	0.01
http-proxy	NetApp NetCache http proxy	6.1.1D8				66	0.01
http-proxy	Squid http proxy	3.1.0.15				65	0.01
http	PDR-M800	1.0				64	0.01
http	thttpd	2.24				63	0.009
http-proxy	UserGate http proxy			Windows		63	0.009
http-proxy	Squid http proxy	3.0.STABLE11				63	0.009
http-proxy	FreeProxy http proxy	4.50		Windows		63	0.009
http	UserGate Firewall and Proxy Server		UserGate			62	0.009
http-proxy	Squid http proxy	3.0.STABLE14				61	0.009
http-proxy	Squid http proxy	2.5.STABLE14-NT				60	0.009
http	Apache	2.0.55	(Debian) PHP/5.1.2-1			60	0.009
http-proxy	Squid http proxy	3.1.0.17				58	0.009
http	nginx	0.7.67				57	0.009
arcserve	ARCserve Discovery					57	0.009
http	Speedr	0.1				56	0.008
http-proxy	WinProxy http proxy			Windows		56	0.008
http-proxy	Squid http proxy	3.0.STABLE21				55	0.008
http	Apache	2.2.14	(Ubuntu)			54	0.008
http-proxy	Squid http proxy	2.6.STABLE10				53	0.008
http-proxy	Squid http proxy	3.2.0.5-20110305				51	0.008
socks5						49	0.007
http-proxy	Squid http proxy	2.5.STABLE2				49	0.007
http	nginx	1.0.8				49	0.007
http-proxy	Squid http proxy	3.0.STABLE23-BZR				48	0.007
http			proxy			47	0.007
http-proxy	Squid http proxy	3.1.0.13				46	0.007
http	Apache	1.3.28	(SolutionIP) mod_perl/1.28 mod_ssl/2.8.15 OpenSSL/0.9.7b			46	0.007
http	Gadspot/Avtech AV787 webcam http config				webcam	45	0.007
http	Boa HTTPd	0.94.13				45	0.007
ftp	vsftpd (before 2.0.8) or WU-FTPD					45	0.007
http-proxy	Microsoft ISA Server http proxy			Windows		44	0.007
http-proxy	BlueCoat SG-400 http proxy				proxy server	44	0.007
http-proxy	Squid http proxy	2.7.STABLE9-20110824				43	0.006
http	Lusca	LUSCA_HEAD-r14809				43	0.006
ftp	Microsoft ftpd			Windows		43	0.006
http	lighttpd	1.4.20				42	0.006
http	Apache		SSL-only mode			42	0.006
http-proxy	Squid http proxy	3.1.0.16				40	0.006
http-proxy	Fortech Proxy+ http admin			Windows		40	0.006
http	Intoto httpd	1.0				39	0.006
http	DrayTek Vigor 2800-series ADSL router httpd				broadband router	39	0.006
http-proxy	Symantec firewall http proxy		Simple, Secure Web Server 1.1		firewall	38	0.006
http-proxy	Squid http proxy	2.6.STABLE6				38	0.006
rationalsoft	Rational Soft Hidden Administrator Server		ha_server.exe	Windows		37	0.006
ftp						37	0.006
socks5			Username/password authentication required			36	0.005
http	Apache	0.6.5				36	0.005
http-proxy	Squid http proxy	2.5.STABLE13-20060330				34	0.005
http	Linksys router http config		device model BEFSR81v3		WAP	34	0.005
http	Draytek Vigor ADSL router webadmin				broadband router	34	0.005
http	DD-WRT milli_httpd			Linux	WAP	34	0.005
ssh	OpenSSH	5.3	protocol 2.0			33	0.005
http	XCN/3					33	0.005
http-proxy	Squid http proxy	3.2.0.18				33	0.005
http	lighttpd	1.4.28				33	0.005
http	GoAhead-Webs					33	0.005
http	DD-WRT milli_httpd					33	0.005
ssh	OpenSSH	5.3p1 Debian 3ubuntu7	Ubuntu Linux; protocol 2.0	Linux		32	0.005
remoting	MS .NET Remoting services					32	0.005
http-proxy	Squid http proxy	3.1.15-20111008-r10380				32	0.005
http-proxy	Squid http proxy	2.7.STABLE6-20090224				32	0.005
http	Mbedthis-Appweb	2.0.4				32	0.005
http	AsyncWeb					32	0.005
http-proxy	NetApp NetCache http proxy	6.0.2				31	0.005
http-proxy	JanaServer http proxy	2.5.0.133		Windows		31	0.005
http	Jetty	8.0.y.z-SNAPSHOT				31	0.005
ssl	TLS	1.0				30	0.005
http	Cross Web Server					30	0.005
http	Apache	2.2.22	(Unix)			30	0.005
http	Apache	2.2.22	(Ubuntu)			29	0.004
http	Apache	2.2.15	(CentOS)			29	0.004
nntp	INN nntpd		posting ok			28	0.004
http	uTorrent utserver web interface			Linux		28	0.004
http	D-Link DIR-300 WAP http admin				WAP	28	0.004
http	squid					27	0.004
http-proxy	Squid http proxy	3.1.7				27	0.004
http	DVR Systems webcam http interface				webcam	27	0.004
ssh	Dropbear sshd	0.52	protocol 2.0	Linux		26	0.004
http	squid3	3.1.0.6				26	0.004
http-proxy	Squid http proxy	2.6.STABLE22+ICAP				26	0.004
http	micro_httpd					26	0.004
ssh	OpenSSH	5.5p1 Debian 6+squeeze2	protocol 2.0	Linux		25	0.004
http			UserGate			25	0.004
http-proxy	Squid http proxy	3.0.RC1+PatchSets-20071001				25	0.004
http-proxy	Squid http proxy	2.2.STABLE5				25	0.004
http	Netgear DG834G router http config				router	25	0.004
ftp	Pure-FTPd					25	0.004
vnc	RealVNC Enterprise		protocol 4.1			24	0.004
http	Ubicom	1.1				24	0.004
http-proxy	Squid http proxy	3.2.5				24	0.004
http-proxy	Squid http proxy	2.5.STABLE10-CVS				24	0.004
http-proxy	Squid http proxy	2.4.STABLE2				24	0.004
http	Boa HTTPd	0.93.15				24	0.004
upnp	Microsoft Windows UPnP			Windows		23	0.003
ssh	OpenSSH	5.1p1 Debian 5	protocol 2.0	Linux		23	0.003
smtp	Exim smtpd					23	0.003
http	WinGate Engine					23	0.003
http-proxy	Squid http proxy	3.0.STABLE6				23	0.003
http-proxy	Squid http proxy	2.4.STABLE3				23	0.003
http-proxy	awarrenhttp http proxy	2.0.0.4.7				23	0.003
http	lighttpd	1.4.30				23	0.003
http	TP-LINK Router					22	0.003
http-proxy	Squid http proxy	2.5.STABLE14-20060721				22	0.003
http-proxy	JanaServer http proxy	2.4.8.51		Windows		22	0.003
http	MikroTik router http config				router	22	0.003
http	Apache	2.2.14	(Unix) mod_ssl/2.2.14 OpenSSL/0.9.8l mod_perl/2.0.4 Perl/v5.10.0			22	0.003
ftp	FileZilla ftpd	0.9.41 beta		Windows		22	0.003
vnc			protocol 3			21	0.003
http	Router					21	0.003
http-proxy	Squid http proxy	2.5.STABLE10-NT				21	0.003
http-proxy	JanaServer http proxy	2.5.0.173		Windows		21	0.003
http	Microsoft IIS httpd	7.0		Windows		21	0.003
http	Allegro RomPager	4.07 UPnP/1.0	ZyXEL ZyWALL 2			21	0.003
http	Router Webserver					20	0.003
http-proxy	NetApp NetCache http proxy	6.0.5P1				20	0.003
http	Netgear DG834 router http config				broadband router	20	0.003