Overview of services running on Port 255 TCP.
~15 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			4751	31.549
http	SonicWALL		2009	13.341
chat	AIM or ICQ server		1867	12.398
ssl	SSLv3		1000	6.641
no match	-/-	-/-	943	6.262
http	Apache	2.2.8	688	4.569
http	lighttpd	1.4.19	384	2.55
smtp			319	2.118
http	AIM	1.0	314	2.085
smtp	Postfix smtpd		288	1.912
http	lighttpd	1.4.29	255	1.693
http	GoAhead-Webs httpd		125	0.83
http	Microsoft IIS httpd		123	0.817
http	Microsoft HTTPAPI httpd	2.0	99	0.657
ssh			92	0.611
http	thttpd	2.24	72	0.478
http	Microsoft IIS httpd	6.0	61	0.405
http	Apache Tomcat/Coyote JSP engine	1.1	56	0.372
telnet			55	0.365
http	Netwave IP camera http config		47	0.312
smtp	Microsoft Exchange smtpd		44	0.292
smtp	Exim smtpd		39	0.259
arcserve	ARCserve Discovery		37	0.246
vnc	VNC		35	0.232
http	Avtech AVN801 network camera	1.0	34	0.226
http	Apache		33	0.219
smtp	Microsoft ESMTP	6.0.3790.4675	31	0.206
http-proxy	Squid http proxy	2.6.STABLE12	27	0.179
http	Apache	2.2.3	27	0.179
http	PDR-M800	1.0	26	0.173
http	Boa HTTPd	0.94.14rc21	26	0.173
http	Apache	2.2.14	26	0.173
smtp	Sendmail		25	0.166
ftp	Microsoft ftpd		23	0.153
http	thttpd	2.25b	22	0.146
ftp			22	0.146
http	thttpd		21	0.139
http-proxy	Squid http proxy	2.7.STABLE9	21	0.139
http	Hikvision-Webs		20	0.133
smtp	Exim smtpd	4.77	18	0.12
http	Apache	2.2.22	17	0.113
http	Apache	2.2.16	16	0.106