Overview of services running on Port 2525 TCP.
~294 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
smtp			68979	23.462
smtp	PowerMTA smtpd	3.5r15	59490	20.234
smtp	Exim smtpd	4.77	35789	12.173
smtp	Postfix smtpd		35491	12.072
smtp	Exim smtpd	4.69	15756	5.359
no match	-/-	-/-	7583	2.579
smtp	Exim smtpd		6974	2.372
smtp	Sendmail	8.13.1/8.13.1	4915	1.672
smtp	Microsoft ESMTP	6.0.3790.4675	4643	1.579
http			3965	1.349
smtp	Microsoft Exchange smtpd		3825	1.301
irc	Dancer ircd		3692	1.256
http	SonicWALL		3526	1.199
smtp	PowerMTA smtpd	3.5r13	2802	0.953
http	Dart WebServer Tool	1.0	2120	0.721
telnet	Cisco IOS telnetd		2080	0.707
eggdrop	Eggdrop IRC bot console	1.6.21	1965	0.668
smtp	Sendmail	8.13.8/8.13.8	1703	0.579
chat	AIM or ICQ server		1562	0.531
telnet			1337	0.455
smtp	Sendmail		1263	0.43
http	Apache	2.2.8	1043	0.355
smtp	PowerMTA smtpd	3.5r16	852	0.29
smtp	Symantec Enterprise Security manager smtpd		812	0.276
http	AIM	1.0	665	0.226
smtp	Microsoft ESMTP	6.0.3790.3959	621	0.211
smtp	PowerMTA smtpd	3.5r17	546	0.186
smtp	Exim smtpd	4.76	534	0.182
http	lighttpd	1.4.29	433	0.147
smtp	Microsoft ESMTP	7.0.6002.18264	422	0.144
smtp	Communigate Pro SMTP	4.2.4	405	0.138
smtp	Sendmail	8.14.3/8.14.3	395	0.134
http	lighttpd	1.4.19	373	0.127
smtp	Microsoft ESMTP	7.5.7601.17514	361	0.123
http-proxy	EZproxy web proxy		360	0.122
smtp	Sendmail	8.11.6/8.11.6	335	0.114
smtp	rblsmtpd wrapped smtpd		328	0.112
smtp	MailEnable smptd	5.10--	317	0.108
smtp	PowerMTA smtpd	4.0r1	313	0.106
smtp	Sendmail	8.12.11.20060308/8.12.11	309	0.105
http	Gateway-Webs		295	0.1
smtp	MailEnable smptd	1.986--	264	0.09
smtp	Communigate Pro SMTP	5.1.12	263	0.089
smtp	Surgemail smtpd	5.3h2-2	242	0.082
smtp	Exim smtpd	4.74	232	0.079
http	Microsoft IIS httpd	6.0	222	0.076
smtp	Exim smtpd	4.72	201	0.068
smtp	Sendmail	8.14.4/8.14.4	195	0.066
smtp	Exim smtpd	4.63	181	0.062
telnet	Cisco 1721 router telnetd		165	0.056
smtp	Microsoft ESMTP	6.0.3790.1830	160	0.054
smtp	Microsoft Exchange 2010 smtpd		150	0.051
smtp	MailEnable smptd	4.26--	148	0.05
http	GoAhead-Webs embedded httpd		144	0.049
smtp	Cisco PIX sanitized smtpd		135	0.046
smtp	MailEnable smptd	0-3.63-	121	0.041
smtp	IMail NT-ESMTP	11.5 1-1	120	0.041
smtp	Microsoft ESMTP	5.0.2195.7381	116	0.039
http	Avtech AVN801 network camera	1.0	116	0.039
smtp	IceWarp smtpd	10.0.7	113	0.038
smtp	Sendmail	8.12.11/8.12.11	112	0.038
http	DrcomServer1.0		112	0.038
http	Netwave IP camera http config		109	0.037
smtp	Communigate Pro SMTP	5.0.14	105	0.036
smtp	Sendmail	8.12.10/8.12.10	103	0.035
http	Cassini	4.0.0.0	102	0.035
smtp	IMail NT-ESMTP	11.0 1-1	100	0.034
http	Apache Tomcat/Coyote JSP engine	1.1	100	0.034
smtp	MailEnable smptd	0-2.53-	98	0.033
http	Apache		92	0.031
ssh			91	0.031
http	GoAhead-Webs		88	0.03
smtp	MailEnable smptd	6.54--6.54	86	0.029
postgrey	Postfix Greylist Daemon		83	0.028
http	Microsoft IIS httpd	7.5	83	0.028
http	Apache	1.3.6	79	0.027
http	thttpd	2.24 26oct2003	76	0.026
smtp	Exim smtpd	4.80	75	0.026
ssh	OpenSSH	4.3	71	0.024
smtp	Sendmail	8.14.2/8.14.2	71	0.024
smtp	JAMES smtpd	2.3.2	71	0.024
smtp	MDaemon smtpd	9.6.3	70	0.024
smtp	IMail NT-ESMTP	11.02 1-1	70	0.024
smtp	Microsoft ESMTP	7.0.6001.18000	69	0.023
smtp	Alt-N MDaemon mail server	12.5.6	68	0.023
ftp	Microsoft ftpd		68	0.023
smtp	MailEnable smptd	0-1.87-	65	0.022
http	Buffalo AirStation http config		65	0.022
smtp	Communigate Pro SMTP	5.1.16	64	0.022
smtp	Sendmail	8.8.7/8.8.7	63	0.021
smtp	Surgemail smtpd	5.3h-1	62	0.021
smtp	MailEnable smptd	0-2.40-	61	0.021
http-proxy	CCProxy http proxy		61	0.021
smtp	MailEnable smptd	1.983--	59	0.02
smtp	MailEnable smptd	6.0--	57	0.019
http	PDR-M800	1.0	56	0.019
smtp	Sendmail	8.13.7/8.13.7	55	0.019
smtp	Axigen smtpd		55	0.019
vnc	VNC		54	0.018
smtp	MailEnable smptd	--4.26	54	0.018
smtp	Sendmail	8.14.5/8.14.5	53	0.018
smtp	MailEnable smptd	0-4.26-	52	0.018
http	WangWnagSimpleServer	1.0	52	0.018
http	Apache	2.2.3	52	0.018
smtp	MailEnable smptd	--3.63	49	0.017
smtp	MailEnable smptd	5.51--	48	0.016
http	Boa HTTPd	0.94.14rc21	48	0.016
smtp	Barracuda Networks Spam Firewall smtpd		47	0.016
http	Apache	2.2.14	47	0.016
smtp	MailEnable smptd	4.17--4.17	46	0.016
smtp	MailEnable smptd	1.95--	46	0.016
smtp	Alt-N MDaemon mail server	11.0.3	46	0.016
http	Microsoft IIS httpd	7.0	46	0.016
smtp	Microsoft ESMTP	5.0.2195.6713	45	0.015
smtp	Kerio Connect smtpd	7.4.1	45	0.015
smtp	Sendmail	8.14.1/8.14.1	44	0.015
smtp	Kerio Connect smtpd	7.4.0	43	0.015
http	mini_httpd	1.19 19dec2003	43	0.015
smtp	Lotus Domino smtpd	8.5.3	42	0.014
mongodb	MongoDB	1	42	0.014
smtp	Communigate Pro SMTP	4.2.10	41	0.014
remoting	MS .NET Remoting services		41	0.014
ssh	OpenSSH	5.1p1 Debian 5	39	0.013
smtp	XMail SMTP server	1.27	37	0.013
smtp	MailEnable smptd	0-3.62-	37	0.013
smtp	MailEnable smptd	6.56--	36	0.012
smtp	Communigate Pro SMTP	5.4.4	36	0.012
smtp	Exim smtpd	4.66	35	0.012
http	GeoVision GeoHttpServer for webcams		35	0.012
smtp	MailEnable smptd	3.62--	34	0.012
smtp	MailEnable smptd	1.981--	34	0.012
smtp	MailEnable smptd	0-1.82-	34	0.012
smtp	MailEnable smptd	4.23--	33	0.011
smtp	MailEnable smptd	0-5.51-	33	0.011
http	Microsoft IIS httpd		33	0.011
http	Apache	2.2.22	33	0.011
smtp-proxy	ESET NOD32 anti-virus smtp proxy		32	0.011
smtp	Alt-N MDaemon mail server	11.0.0	32	0.011
http	thttpd	2.25b 29dec2003	32	0.011
smtp	Sendmail	8.12.8/8.12.8	30	0.01
smtp	MailEnable smptd	0-3.6-	30	0.01
smtp	Alt-N MDaemon mail server	10.0.0	30	0.01
ssh	OpenSSH	5.3	29	0.01
smtp	Alt-N MDaemon mail server	6.8.5	29	0.01
irc-proxy	psyBNC	2.3.2-9	29	0.01
http	uc-httpd	1.0.0	29	0.01
http	Apache	2.2.16	29	0.01
bittorrent	Bittorrent P2P client		29	0.01
ssh	NetScreen sshd		28	0.01
smtp	Surgemail smtpd	5.2a-1	27	0.009
smtp	Microsoft ESMTP	7.5.7600.16601	27	0.009
smtp	MailEnable smptd	4.22--	27	0.009
smtp	IA Mailserver smtpd		27	0.009
smtp	Exim smtpd	4.73	27	0.009
smtp	Dumbster fake smtpd		27	0.009
smtp	Cisco IronPort C160 firewall smtpd		27	0.009
http	Cassini	5.0.0.0	27	0.009
smtp	MailEnable smptd	5.11--	26	0.009
smtp	MailEnable smptd	4.26--4.26	26	0.009
nntp	INN nntpd		26	0.009
http	D-Link DIR-300 WAP http admin		26	0.009
smtp	Alt-N MDaemon mail server	12.0.3	25	0.009
http	uTorrent WebUI		25	0.009
http	MikroTik router config httpd		25	0.009
http	Cross Web Server		25	0.009
smtp	MailEnable smptd	6.53--	24	0.008
http	Hikvision-Webs		24	0.008
http	Apache	2.2.9	24	0.008
ftp	zFTPServer	5.0 build 2009-03-12	24	0.008
ssh	OpenSSH	5.2	23	0.008
smtp	Kerio Connect smtpd	7.3.2	23	0.008
http	Intoto httpd	1.0	23	0.008
http	Gadspot/Avtech AV787 webcam http config		23	0.008
ssl	TLS	1.0	22	0.007
smtp	MAILsweeper SMTP proxy		22	0.007
smtp	MailEnable smptd	6.03--	22	0.007
smtp	MailEnable smptd	0-5.11-	22	0.007
smtp	MailEnable Enterprise smptd	2.53	22	0.007
http	Microsoft HTTPAPI httpd	2.0	22	0.007
http	Boa HTTPd	0.94.13	22	0.007
smtp	MailEnable smptd	5.5--5.5	21	0.007
smtp	MailEnable smptd	0-5.01-	21	0.007
smtp	Kerio Connect smtpd	7.3.1 patch 2	21	0.007
smtp	Exim smtpd	4.67	21	0.007
telnet	Cisco router telnetd		20	0.007
smtp	Kerio Connect smtpd	7.4.2	20	0.007
smtp	IceWarp smtpd	9.1.0	20	0.007
smtp	ArGoSoft Mail Server Plus	1.8.9.2	20	0.007
http	Apache	1.3.28	20	0.007
ftp	vsftpd	2.0.8 or later	20	0.007
smtp	Symantec Messaging Gateway smtpd		19	0.006
smtp	Sendmail	8.14.4/8.14.3	19	0.006
smtp	IMail NT-ESMTP	12.0.0.348 1-1	19	0.006
smtp	Exim smtpd	3.36	19	0.006
smtp	Alt-N MDaemon mail server	12.5.4	19	0.006
http	DVR Systems webcam http interface		19	0.006
ftp	Pure-FTPd		19	0.006
ftp			19	0.006
telnet	Linux telnetd		18	0.006
smtp-proxy	Python SMTP Proxy	0.2	18	0.006
smtp	MailEnable smptd	0-5.10-	18	0.006
smtp	MailEnable smptd	0-3.14-	18	0.006
smtp	Alt-N MDaemon mail server	10.1.1	18	0.006
smtp	Allworx 6x VoIP phone smtpd		18	0.006
http	Microsoft IIS httpd	5.1	18	0.006
http	Httpd	1.0	18	0.006
ssh	OpenSSH	5.3p1 Debian 3ubuntu7	17	0.006
smtp	MailEnable smptd	6.5--	17	0.006
smtp	MailEnable smptd	-1.87-	17	0.006
smtp	IMail NT-ESMTP	11.5 2-1	17	0.006
smtp	Alt-N MDaemon mail server	12.5.3	17	0.006
http	thttpd		17	0.006
http	MiniServ	0.01	17	0.006
http	Mercury SiteScope Application Managment httpd	7.6	17	0.006
http	Mbedthis-Appweb	2.0.4	17	0.006
http	lighttpd	1.4.20	17	0.006
http	Apache	2.2.15	17	0.006
upnp	Portable SDK for UPnP devices	1.3.1	16	0.005
ssh	Dropbear sshd	0.52	16	0.005
smtp	Surgemail smtpd	3.8k4-4	16	0.005
smtp	Microsoft ESMTP	7.5.7600.16544	16	0.005
smtp	Microsoft ESMTP	6.0.3790.0	16	0.005
smtp	MDaemon smtpd	12.5.6	16	0.005
smtp	MDaemon smtpd	12.5.3	16	0.005
smtp	MailEnable smptd	1.96--	16	0.005
smtp	Communigate Pro SMTP	5.2.13	16	0.005
http	DD-WRT milli_httpd		16	0.005
directconnect	Direct Connect P2P		16	0.005
smtp	XMail SMTP server	1.25	15	0.005
smtp	Surgemail smtpd	6.1c-1	15	0.005
smtp	Sendmail	8.13.6/8.13.6	15	0.005
smtp-proxy	UserGate smtp proxy		15	0.005
smtp	Merak Mail Server smtpd	8.0.3	15	0.005
smtp	MailEnable smptd	6.56--6.56	15	0.005
smtp	MailEnable smptd	--6.51	15	0.005
smtp	MailEnable smptd	6.01--	15	0.005
smtp	MailEnable smptd	0-6.54-	15	0.005
smtp	Exim smtpd	4.68	15	0.005
smtp	Alt-N MDaemon mail server	10.1.0	15	0.005
http	Netgear DG834G router http config		15	0.005
http	MikroTik router http config		15	0.005
ftp	vsftpd (before 2.0.8) or WU-FTPD		15	0.005