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	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			34413	5.18
http-proxy	Squid http proxy		29754	4.479
http	Apache		25302	3.809
http	Apache	2.0.52	16831	2.533
http-proxy	Squid http proxy	3.1.19	14353	2.16
http	Microsoft IIS httpd	5.0	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	alphapd		9911	1.492
http	Apache	2.0.63	8783	1.322
http-proxy	Squid http proxy	2.7.STABLE7	8532	1.284
http	Apache (Linux)		8506	1.28
http	Apache	2.2.3	7734	1.164
http	GoAhead-Webs httpd		7084	1.066
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	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
irc	Dancer ircd		4095	0.616
http	SonicWALL		3952	0.595
http	Secure Computing Sidewinder firewall http admin		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-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-proxy	3proxy http proxy		2014	0.303
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	1238	0.186
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		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	Apache	2.0.46	513	0.077
http-proxy	Squid http proxy	3.2.3	507	0.076
http-proxy	Squid http proxy	3.1.19-20120523-r10446	494	0.074
http-proxy	Oops! http proxy		492	0.074
http	lighttpd	1.4.19	475	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
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		353	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	CCProxy http proxy		279	0.042
http-proxy	Squid http proxy	2.4.STABLE6	275	0.041
http	TreeNeWS httpd	0.0.1	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		228	0.034
http	CCProxy		227	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-proxy	Squid http proxy	2.6.STABLE23	204	0.031
http-proxy	Kerio Control http proxy		195	0.029
http	Microsoft IIS httpd	6.0	193	0.029
http	Microsoft HTTPAPI httpd	2.0	192	0.029
http	Avtech AVN801 network camera	1.0	192	0.029
http	Apache Tomcat/Coyote JSP engine	1.1	191	0.029
http	GeoVision GeoHttpServer for webcams		187	0.028
http	Apache	2.2.8	187	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	Squid http proxy	3.1.3	164	0.025
http	Apache	2.2.22	155	0.023
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		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	Boa HTTPd	0.94.14rc21	123	0.019
http	Ubuntu	lucid UPnP	113	0.017
http-proxy	Squid http proxy	3.0.STABLE9	112	0.017
http-proxy	MikroTik HttpProxy		112	0.017
http	thttpd	2.24 26oct2003	111	0.017
http	Apache	2.2.17	111	0.017
http-proxy	Tinyproxy	1.6.0	110	0.017
http	Apache	2.2.16	110	0.017
http	mini_httpd	1.19 19dec2003	109	0.016
vnc	VNC		106	0.016
ssh			105	0.016
http	uc-httpd	1.0.0	102	0.015
http	MikroTik router config httpd		101	0.015
http	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-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	92	0.014
http	thttpd		92	0.014
http	Microsoft IIS httpd	7.5	91	0.014
socks5			90	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	Apache	2.2.9	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
http	UserGate Firewall and Proxy Server		77	0.012
ssh	OpenSSH	4.3	76	0.011
http-proxy	Squid http proxy	3.0.STABLE24	75	0.011
http	Apache	2.0.55	74	0.011
http-proxy	JanaServer http proxy	2.5.1.189	73	0.011
telnet			72	0.011
http-proxy	Squid http proxy	2.3.STABLE4	70	0.011
http	DD-WRT milli_httpd		70	0.011
http	Allegro RomPager	4.51 UPnP/1.0	70	0.011
http	Linksys wireless-G WAP http config		67	0.01
http	uTorrent WebUI		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		63	0.009
http-proxy	Squid http proxy	3.0.STABLE11	63	0.009
http-proxy	FreeProxy http proxy	4.50	63	0.009
http	Linksys router http config		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	2.2.15	59	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		56	0.008
http	Apache	1.3.28	56	0.008
http-proxy	Squid http proxy	3.0.STABLE21	55	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
http-proxy	Squid http proxy	2.5.STABLE2	49	0.007
http	nginx	1.0.8	49	0.007
http	Apache	2.2.21	49	0.007
http-proxy	Squid http proxy	3.0.STABLE23-BZR	48	0.007
http-proxy	Squid http proxy	3.1.0.13	46	0.007
http	Apache	1.3.27	46	0.007
http	Gadspot/Avtech AV787 webcam http config		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		44	0.007
http-proxy	BlueCoat SG-400 http proxy		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		43	0.006
http	lighttpd	1.4.20	42	0.006
http-proxy	Squid http proxy	3.1.0.16	40	0.006
http-proxy	Fortech Proxy+ http admin		40	0.006
http	Intoto httpd	1.0	39	0.006
http	DrayTek Vigor 2800-series ADSL router httpd		39	0.006
http-proxy	Symantec firewall http proxy		38	0.006
http-proxy	Squid http proxy	2.6.STABLE6	38	0.006
rationalsoft	Rational Soft Hidden Administrator Server		37	0.006
ftp			37	0.006
http	Apache	0.6.5	36	0.005
http	Apache	2.2.10	35	0.005
http-proxy	Squid http proxy	2.5.STABLE13-20060330	34	0.005
http	lighttpd	1.4.28	34	0.005
http	GoAhead-Webs		34	0.005
http	Draytek Vigor ADSL router webadmin		34	0.005
ssh	OpenSSH	5.3	33	0.005
http	XCN/3		33	0.005
http-proxy	Squid http proxy	3.2.0.18	33	0.005
ssh	OpenSSH	5.3p1 Debian 3ubuntu7	32	0.005
remoting	MS .NET Remoting services		32	0.005
http	TP-LINK Router		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	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	micro_httpd		29	0.004
http	Apache	2.2.13	29	0.004
nntp	INN nntpd		28	0.004
http	uTorrent utserver web interface		28	0.004
http	D-Link DIR-300 WAP http admin		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		27	0.004
http	Apache	2.2.11	27	0.004
ssh	Dropbear sshd	0.52	26	0.004
http	squid3	3.1.0.6	26	0.004
http-proxy	Squid http proxy	2.6.STABLE22+ICAP	26	0.004
ssh	OpenSSH	5.5p1 Debian 6+squeeze2	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		25	0.004
ftp	Pure-FTPd		25	0.004
vnc	RealVNC Enterprise		24	0.004
ssh	OpenSSH	5.1p1 Debian 5	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		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	Router Webserver		22	0.003
http-proxy	Squid http proxy	2.5.STABLE14-20060721	22	0.003
http-proxy	JanaServer http proxy	2.4.8.51	22	0.003
http	MikroTik router http config		22	0.003
http	Apache	2.2.4	22	0.003
ftp	FileZilla ftpd	0.9.41 beta	22	0.003
vnc			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	21	0.003
http	Microsoft IIS httpd	7.0	21	0.003
http	Allegro RomPager	4.07 UPnP/1.0	21	0.003
http-proxy	NetApp NetCache http proxy	6.0.5P1	20	0.003
http	Netgear DG834 router http config		20	0.003
http	Apache	2.2.6	20	0.003
http	Apache	2.0.53	20	0.003
http	Apache	1.3.41	20	0.003
http	uTorrent http admin	3.0	19	0.003
http	Tomato WAP firmware httpd		19	0.003
http-proxy	Tinyproxy	1.8.1	19	0.003
http-proxy	Squid http proxy	3.2.0.5	19	0.003
http-proxy	Squid http proxy	2.6.STABLE16+ICAP	19	0.003
netbios-ssn			18	0.003
irc	Unreal ircd		18	0.003
http	TwistedWeb httpd	8.2.0	18	0.003
http	Transmission BitTorrent management httpd		18	0.003
http-proxy	Squid http proxy	3.1.15-20110829	18	0.003
http-proxy	Squid http proxy	3.1.12.1	18	0.003
http-proxy	Squid http proxy	3.0.STABLE23	18	0.003
http-proxy	Squid http proxy	2.5.STABLE8	18	0.003
http	Lusca	LUSCA r14850 patched	18	0.003
http	http server 1.0		18	0.003
http	Buffalo AirStation http config		18	0.003
http	antid		18	0.003
webcache	webcache		17	0.003
ssh	OpenSSH	5.9p1 Debian 5ubuntu1	17	0.003
ssh	OpenSSH	5.8p2_hpn13v11	17	0.003
smtp			17	0.003
http-proxy	Squid http proxy	3.1.0.8	17	0.003
http	Apache	2.0.40	17	0.003
directconnect	Direct Connect P2P		17	0.003
http-proxy	Squid http proxy	3.2.4	16	0.002
http-proxy	F5 BIG-IP load balancer http proxy		16	0.002
http	Net-OS 5.xx UPnP	1.0	16	0.002
http	Microsoft IIS httpd	9.2	16	0.002
http	Jetty	6.1.17	16	0.002
http	awarrenhttp	2.0.0.2.3	16	0.002
ssh	MikroTik RouterOS sshd		15	0.002
rtsp	Avtech MPEG4 DVR control rtspd		15	0.002
openvpn	OpenVPN		15	0.002
http	WYM httpd	1.0	15	0.002
http	Virata-EmWeb	6.0.1	15	0.002
http-proxy	Squid http proxy	3.2.0.15	15	0.002
http-proxy	Squid http proxy	2.6.STABLE4	15	0.002
http-proxy	Squid http proxy	2.6.STABLE3	15	0.002
http	nginx	1.0.11	15	0.002
http	Microsoft ISA httpd		15	0.002
http	Lusca		15	0.002
http	lighttpd	1.4.26	15	0.002
http	Apache	2.2.0	15	0.002
http	Apache	2.0.54	15	0.002