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	Count	Percent
http-proxy	Squid http proxy	399420	60.121
no match	-/-	63913	9.62
http	Apache	61742	9.294
http		34413	5.18
http	Microsoft IIS httpd	19098	2.875
http	alphapd	9911	1.492
http	Apache (Linux)	8506	1.28
http	GoAhead-Webs httpd	7084	1.066
http-proxy	MikroTik http proxy	4921	0.741
http-proxy	BlueCoat http proxy	4700	0.707
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	wanduck	2944	0.443
http	dcs-lig-httpd	2729	0.411
chat	AIM or ICQ server	2582	0.389
http	lighttpd	2420	0.364
http-proxy	3proxy http proxy	2014	0.303
http	Urchin RSS aggregator	1767	0.266
http	thttpd	1244	0.187
http	Tiny redirect server	851	0.128
http	nginx	839	0.126
http	UserGate http report area	818	0.123
http	AIM	662	0.1
http-proxy	Tinyproxy	507	0.076
http-proxy	NetApp NetCache http proxy	496	0.075
http-proxy	Oops! http proxy	492	0.074
ssh	OpenSSH	428	0.064
socks-proxy	Socks4A	401	0.06
http-proxy	WinRoute http proxy	353	0.053
http	WangWnagSimpleServer	340	0.051
http-proxy	DansGuardian HTTP proxy	295	0.044
http-proxy	CCProxy http proxy	279	0.042
http	TreeNeWS httpd	255	0.038
http-proxy	EZproxy web proxy	228	0.034
http	CCProxy	227	0.034
http	Boa HTTPd	222	0.033
http	DrcomServer1.0	213	0.032
http-proxy	Kerio Control http proxy	195	0.029
http	Microsoft HTTPAPI httpd	192	0.029
http	Avtech AVN801 network camera	192	0.029
http	Apache Tomcat/Coyote JSP engine	191	0.029
http	GeoVision GeoHttpServer for webcams	187	0.028
http-proxy	JanaServer http proxy	172	0.026
http	Netwave IP camera http config	152	0.023
http	TBS	143	0.022
http	NCSA	137	0.021
http	HandyCache	114	0.017
http	Ubuntu	113	0.017
http-proxy	MikroTik HttpProxy	112	0.017
http	mini_httpd	112	0.017
vnc	VNC	106	0.016
ssh		105	0.016
http	uc-httpd	102	0.015
http	Allegro RomPager	102	0.015
http	MikroTik router config httpd	101	0.015
http-proxy	AVM KEN! http proxy	93	0.014
upnp	Portable SDK for UPnP devices	92	0.014
socks5		90	0.014
http	Hikvision-Webs	89	0.013
http	AppWork GmbH HttpServer	89	0.013
http	Lusca	86	0.013
http	WORLDWLAN PREMIUM Edition Server by XCONY	83	0.012
http	Squid	83	0.012
http	UserGate Firewall and Proxy Server	77	0.012
http	Jetty	76	0.011
http-proxy	FreeProxy http proxy	73	0.011
telnet		72	0.011
http	DD-WRT milli_httpd	70	0.011
http	Linksys wireless-G WAP http config	67	0.01
http	uTorrent WebUI	66	0.01
http	squid	64	0.01
http	PDR-M800	64	0.01
http-proxy	UserGate http proxy	63	0.009
http	Linksys router http config	62	0.009
http	Speedr	58	0.009
arcserve	ARCserve Discovery	57	0.009
http-proxy	WinProxy http proxy	56	0.008
ftp	Microsoft ftpd	46	0.007
http	Gadspot/Avtech AV787 webcam http config	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	Fortech Proxy+ http admin	44	0.007
http-proxy	BlueCoat SG-400 http proxy	44	0.007
ssh	Dropbear sshd	42	0.006
mysql	MySQL	39	0.006
http	Intoto httpd	39	0.006
http	DrayTek Vigor 2800-series ADSL router httpd	39	0.006
http-proxy	Symantec firewall http proxy	38	0.006
ftp	FileZilla ftpd	38	0.006
rationalsoft	Rational Soft Hidden Administrator Server	37	0.006
ftp		37	0.006
http	Mbedthis-Appweb	34	0.005
http	GoAhead-Webs	34	0.005
http	Draytek Vigor ADSL router webadmin	34	0.005
http	XCN/3	33	0.005
http-proxy	awarrenhttp http proxy	33	0.005
remoting	MS .NET Remoting services	32	0.005
http	TP-LINK Router	32	0.005
http	AsyncWeb	32	0.005
ssl	TLS	30	0.005
http	Cross Web Server	30	0.005
http	micro_httpd	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
smtp	Exim smtpd	27	0.004
http	DVR Systems webcam http interface	27	0.004
http	awarrenhttp	27	0.004
http	squid3	26	0.004
http	Netgear DG834G router http config	25	0.004
ftp	Pure-FTPd	25	0.004
ftp	ProFTPD	25	0.004
vnc	RealVNC Enterprise	24	0.004
http	Ubicom	24	0.004
http-proxy	ziproxy http proxy	24	0.004
http	Jana-Server	24	0.004
upnp	Microsoft Windows UPnP	23	0.003
http	WinGate Engine	23	0.003
http	Indy	23	0.003
smtp	Microsoft ESMTP	22	0.003
http	Router Webserver	22	0.003
http	MikroTik router http config	22	0.003
vnc		21	0.003
http	Virata-EmWeb	21	0.003
http	Router	21	0.003
ftp	Serv-U ftpd	21	0.003
http	Netgear DG834 router http config	20	0.003
http	BusyBox httpd	20	0.003
http	uTorrent http admin	19	0.003
http	TwistedWeb httpd	19	0.003
http	Tomato WAP firmware httpd	19	0.003
netbios-ssn		18	0.003
irc	Unreal ircd	18	0.003
http	Transmission BitTorrent management httpd	18	0.003
http	MiniServ	18	0.003
http	http server 1.0	18	0.003
http	Buffalo AirStation http config	18	0.003
http	antid	18	0.003
ftp	vsftpd	18	0.003
webcache	webcache	17	0.003
smtp		17	0.003
directconnect	Direct Connect P2P	17	0.003
http	Zope httpd	16	0.002
http	RemotelyAnywhere remote PC management httpd	16	0.002
http-proxy	F5 BIG-IP load balancer http proxy	16	0.002
http	Net-OS 5.xx UPnP	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	15	0.002
http	Microsoft ISA httpd	15	0.002
ssh	SCS sshd	14	0.002
smtp	Postfix smtpd	14	0.002
http	webcamXP httpd	14	0.002
http-proxy	WinGate httpd	14	0.002
http	ESET NOD32 anti-virus update httpd	14	0.002
http	Eproxy	14	0.002
vnc	Apple remote desktop vnc	13	0.002
http-proxy	Kerio WinRoute Pro http proxy	13	0.002
http	Boa httpd	13	0.002
vnc	RealVNC Personal	12	0.002
ssh	APC AOS cryptlib sshd	12	0.002
socks4	Connection ok	12	0.002
socks4	Connection failed; username required	12	0.002
smtp	Microsoft Exchange smtpd	12	0.002
http	WindWeb	12	0.002
http	Embedded HTTP Server	12	0.002
http	AIM HTTP	12	0.002
http	World Client WDaemon httpd	11	0.002
http	WebLogic httpd	11	0.002
http	Ubicom httpd	11	0.002
http	TP-LINK WR841N WAP http config	11	0.002
http	TeamViewer httpd	11	0.002
http-proxy	HAVP anti-virus web proxy	11	0.002
http	HttpFileServer httpd	11	0.002
http	Eserv	11	0.002
http	Datum	11	0.002
http	avtech httpd	11	0.002
shoutcast	SHOUTcast server	10	0.002
rtsp		10	0.002
java-rmi	Java RMI	10	0.002
http	TP-LINK WR340G WAP http config	10	0.002
http-proxy	Haproxy http proxy	10	0.002
http	Panasonic webcam http config	10	0.002
http	MS-SDK-HttpServer	10	0.002
http	IronPort WSA firewall http admin	10	0.002
http	Check Point R65 firewall http config	10	0.002