Overview of services running on Port 631 TCP.
~711 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	Digifort Enterprise 6.5 httpd		299302	42.06
ipp	CUPS	1.4	88127	12.384
ipp	CUPS	1.1	54954	7.722
http			27789	3.905
ipp	CUPS	1.5	24555	3.451
ipp	CUPS	1.3	24500	3.443
http	Virata-EmWeb	6.2.1	22163	3.114
http	HP-ChaiSOE	1.0	20807	2.924
ipp	Web-Server httpd	3.0	15230	2.14
ipp	CUPS	1.2	8141	1.144
http	HTTP	1.0	7390	1.038
http	HP JetDirect printer webadmin		7207	1.013
ipp	Xerox Phaser 3500		7195	1.011
ipp	CUPS	1.6	5705	0.802
http	thttpd		5342	0.751
ipp	Xerox WorkCentre IPP		5273	0.741
http	ActionTec TR-069 remote access		4950	0.696
http	SonicWALL		3752	0.527
http	Konica Minolta PageScope Web Connection httpd		3725	0.523
http	Lexmark printer http config		3629	0.51
http	Apache		3553	0.499
soap	gSOAP soap	2.7	3027	0.425
http	Allegro RomPager	4.34	2853	0.401
http	Debut embedded httpd	1.08	2379	0.334
http	Web-Server	3.0	2258	0.317
chat	AIM or ICQ server		2238	0.314
http	HP Officejet Pro 8500 A910 printer http config		2036	0.286
http	HP Jetdirect httpd		1821	0.256
ipp	Canon printer http config	2.21	1757	0.247
ipp	Canon printer http config	2.30	1747	0.245
http	JC-SHTTPD	1.17.22	1629	0.229
http	HP JetDirect Card in a LaserJet printer		1498	0.211
http	HP Officejet Pro 8600 printer http config		1454	0.204
ipp	Epson ippd	1.0	1452	0.204
http	Canon printer web interface		1424	0.2
http	HP Officejet 6500 E710n-z printer http config		1263	0.177
ipp	Canon printer http config	1.00	1232	0.173
no match	-/-	-/-	1101	0.155
http	HP Photosmart D110 series printer http config		1078	0.151
http	HP LaserJet P1606 http config		1066	0.15
ipp	Epson ippd	1.1	986	0.139
http	Debut embedded httpd	0.07	980	0.138
ipp	CUPS	1.3.7	921	0.129
http	HP Photosmart 5510 series printer http config		857	0.12
http	Agranat-EmWeb	5.2.6	852	0.12
http	Apache	2.0.63	849	0.119
http	HP Photosmart B110 series printer http config		814	0.114
http	Kyocera FS-3900DN printer http config	1.2.0	784	0.11
http	HP Photosmart Plus B210 series printer http config		764	0.107
http	HP Deskjet 3050A series printer http config		758	0.107
http	JC-HTTPD	1.11.14	745	0.105
http	Allegro RomPager	4.30	661	0.093
http	AIM	1.0	657	0.092
http	Lexmark printer webadmin		634	0.089
http	Octoshape P2P streaming web service		599	0.084
ipp	Thecus N5200 IPP		566	0.08
http	HP Officejet 6500 E710a-f printer http config		551	0.077
http	HP Photosmart 7510 series printer http config		541	0.076
http	lighttpd	1.4.19	510	0.072
http	Allegro RomPager	4.10	503	0.071
http	HP Photosmart Prem C310 series printer http config		472	0.066
http	KM-httpd	1.2.0	461	0.065
http	lighttpd	1.4.29	438	0.062
http	GoAhead-Webs httpd		424	0.06
http	HP Photosmart 6510 series printer http config		423	0.059
http	HP Photosmart Prem C410 series printer http config		392	0.055
http	Apache	2.2.3	382	0.054
http	JC-SHTTPD	1.17.20	375	0.053
http	PRINT_SERVER WEB	1.0	373	0.052
http	Apache	2.0.59	373	0.052
http	Kyocera IB-21E printer http config		353	0.05
http	HP Officejet 7500 E910 printer http config		337	0.047
http	Apache	1.3.41	320	0.045
http	Debut embedded httpd	0.03	319	0.045
ipp	CUPS	1.3.8	307	0.043
http	HP HTTP Server		306	0.043
http	HP Deskjet 3070 series printer http config		298	0.042
http	JC-HTTPD	1.12.16	288	0.04
http	JC-HTTPD	1.14.18	285	0.04
http	Rapid Logic	1.1	278	0.039
http	Xerox WorkCentre http config		259	0.036
ipp	Canon printer http config	2.00	256	0.036
http	Xerox MicroServer httpd	Xerox11	235	0.033
http	Microsoft IIS httpd	6.0	218	0.031
http	Agranat-EmWeb	5.2.0	216	0.03
http	lighttpd	1.4.11	213	0.03
http	HP Officejet 6700 printer http config		212	0.03
http	Webserver		208	0.029
http	Allegro RomPager	4.01	206	0.029
http	Dell 1815dn printer http config		204	0.029
http	JC-HTTPD	1.14.20	203	0.029
http	Apache Tomcat/Coyote JSP engine	1.1	202	0.028
http	HP Photosmart 5510d series printer http config		184	0.026
ipp	CUPS	1.3.9	175	0.025
http	Konica Minolta 350 printer http config		175	0.025
http	Spyglass MicroServer	2.01FC1	168	0.024
http	HP Officejet Pro 8100 printer http config		161	0.023
ipp	Canon printer http config	2.20	156	0.022
http	Xerox WorkCentre Pro httpd		153	0.022
http	Toshiba e-STUDIO printer http config		142	0.02
http	Konica Minolta 250 printer http config		139	0.02
http	Allegro RomPager	2.00	137	0.019
http	PRINT_SERVER WEB 1.0		132	0.019
http	Konica Minolta bizhub 423 printer http config		130	0.018
http	ZOT-PS-47	9.8.0013	128	0.018
http	thttpd	2.24 26oct2003	128	0.018
ipp	CUPS	1.3.11	120	0.017
http	DrcomServer1.0		120	0.017
ipp	ZOT-PS-35 print server	6.2.0001	109	0.015
http	Avtech AVN801 network camera	1.0	109	0.015
http	Konica Minolta 200 printer http config		106	0.015
http	HP Officejet 6600 printer http config		105	0.015
http	Allegro RomPager	3.10	104	0.015
ipp	Canon printer http config	2.10	101	0.014
http	HP Officejet 4620 series printer http config		99	0.014
ipp	CUPS	1.2.12	97	0.014
ssh			94	0.013
http	Konica Minolta bizhub printer http config		89	0.013
http	GoAhead-Webs embedded httpd		89	0.013
http	Microsoft IIS httpd	7.5	88	0.012
http	Hawking Print Server httpd	5.6.2058	87	0.012
ipp	ZOT-PS-30 print server	8.3.0013	80	0.011
http	Apache	2.2.8	80	0.011
ipp	CUPS	1.2.7	78	0.011
http	Apache	2.0.54	78	0.011
http	Netwave IP camera http config		77	0.011
http	Kyocera IB-21G printer http config		76	0.011
http	Zebra ZTC 105SL label printer http config		75	0.011
http	Dell Laser Printer W5300 http config		75	0.011
ipp	Kyocera Mita KM-1530 IPP		72	0.01
http	Toshiba e-STUDIO 233 copier/printer/fax http config		72	0.01
ipp	Canon printer http config	2.11	70	0.01
http	Apache	2.2.17	70	0.01
http	Konica Minolta 222 printer http config		69	0.01
http	JC-HTTPD	1.3.7	67	0.009
http	ZOT-PS-47	ZOT-PS-47	66	0.009
http	JC-HTTPD	1.16.22	66	0.009
http	Konica Minolta 282 printer http config		65	0.009
http	JC-HTTPD	2.16.20	62	0.009
http	JC-HTTPD	1.16.27	62	0.009
http	Apache	2.2.14	62	0.009
http	Jetty	6.1.26	59	0.008
http	JC-HTTPD	1.16.20	59	0.008
http	Apache	2.2.12	59	0.008
http	Konica Minolta 362 printer http config		55	0.008
http	Allegro RomPager	3.06b1	55	0.008
http	HP Photosmart eStn C510 series printer http config		54	0.008
vnc	VNC		53	0.007
http	Oki Data C5200n printer http config		53	0.007
telnet			51	0.007
http	mini_httpd	1.19 19dec2003	51	0.007
http	Ricoh Aficio MP C4000 http config		50	0.007
ipp	CUPS	1.3.10	49	0.007
http	PDR-M800	1.0	48	0.007
http	Microsoft IIS httpd	7.0	48	0.007
http	JC-HTTPD	1.14.19	48	0.007
http	Boa HTTPd	0.94.14rc21	46	0.006
ipp	ZOT-PS-39 print server	6.2.0001	45	0.006
http	EWS-NIC	1.0	44	0.006
http	Apache	2.2.16	44	0.006
http	ZOT-PS-47	9.8.0021	42	0.006
http	Hikvision-Webs		40	0.006
http	Apache	2.2.22	40	0.006
http	Konica Minolta PageScope Web Connection		39	0.005
http	Web Server	2.0	38	0.005
ipp	ZOT-PS-30 print server	8.3.0008	37	0.005
ipp	Web-Server httpd	3.1	37	0.005
http	Dell Laser Printer 1710n http config		37	0.005
http	3P print server http config		37	0.005
http	thttpd	2.25b 29dec2003	35	0.005
ipp	CUPS	1.2.4	34	0.005
http	RapidLogic httpd	1.1	34	0.005
http	Novell NetWare HTTP Stack		34	0.005
http	D-Link printer/webcam http config		34	0.005
ipp	ZOT-PS-35 print server	6.3.0010	33	0.005
http	print server http config	ZOT-PS-30/8.3.0013	33	0.005
http	Hawking Print Server httpd	5.7.2068	33	0.005
http	uc-httpd	1.0.0	32	0.004
http	print server http config	ZOT-PS-35/6.2.0001	32	0.004
ipp	ZOT-PS-30 print server	8.3.0007	31	0.004
ipp	CUPS	1.3.5	31	0.004
http	Oki Data C5150n printer http config		31	0.004
http	D-Link print server http config	1.0	31	0.004
ipp	ZOT-PS-15 print server	6.8.0104	30	0.004
http	JC-HTTPD	1.12.17	30	0.004
http	Microsoft IIS httpd	5.1	29	0.004
http	Integrated PrintNet Enterprise emHTTPD	1.1	29	0.004
arcserve	ARCserve Discovery		29	0.004
ipp	ZOT-PS-35 print server	6.3.0006	28	0.004
ipp	Canon printer http config	1.10	28	0.004
http	JC-HTTPD	1.16.25	28	0.004
http	TROY Web Admin		27	0.004
http	ZOT-PS-30	8.3.0013	26	0.004
http-proxy	Squid http proxy	2.6.STABLE12	26	0.004
http	Konica Minolta C350 printer http config		26	0.004
http	Oki Data C5400n printer http config		25	0.004
http	Oki Data C3200n printer http config		25	0.004
http	JC-HTTPD	1.15.20	25	0.004
http	HP_Compact_Server		25	0.004
http	EWS-NIC3	10.05	25	0.004
http	Apache	2.0.52	25	0.004
ipp	ZOT-PS-39 print server	6.3.0007	24	0.003
http	ZOT-PS-47	9.8.0016	24	0.003
http	Microsoft IIS httpd		24	0.003
http	Mbedthis-Appweb	2.0.4	24	0.003
http	Kyocera Mita FS-1350DN printer http config		24	0.003
http	Zero One Technology ZOT-PS-19 httpd	8.1.0009	23	0.003
http	Dell Laser Printer M5200 http config		23	0.003
ipp	ZOT-PS-30 print server	8.3.0009	22	0.003
http	ZOT-PS-35	6.2.0001	22	0.003
http	Web-Server	3.1	22	0.003
http	Apache	1.3.26	22	0.003
ftp	Microsoft ftpd		22	0.003
ipp	CUPS	1.3.6	20	0.003
http	Oki Data C5300 printer http config		20	0.003
http	Apache	2.2.15	20	0.003
http	Apache	2.0.53	20	0.003
http	ZOT-PS-13	5.6.2058	19	0.003
http	Apache	2.2.9	19	0.003
ftp	Pure-FTPd		19	0.003
ipp	CUPS	1.3.2	18	0.003
http	ZOT-PS-47	9.8.0017	18	0.003
http	uTorrent WebUI		18	0.003
http	HP Officejet 6100 printer http config		18	0.003
http	GoAhead-Webs		18	0.003
http	Apache	1.3.36	18	0.003
ipp	ZOT-PS-39 print server	6.3.0009	17	0.002
http	print server http config	ZOT-PS-15/6.8.0104	17	0.002
http	Oki Data C5100 printer http config		17	0.002
http	lighttpd	1.4.20	17	0.002
http	Gadspot/Avtech AV787 webcam http config		17	0.002
http	FUJITSU-XL-HTTP	1.00	17	0.002
http	DVR Systems webcam http interface		17	0.002
ipp	ZOT-PS-35 print server	6.3.0009	16	0.002
ipp	ZOT-PS-30 print server	8.2.0005	16	0.002
http	silex Web Admin		16	0.002
http	Lexmark Optra T612 printer http config		16	0.002
ipp	ZOT-PS-35 print server	6.3.0007	15	0.002
ipp	CUPS	1.3.4	15	0.002
http	Microplex emHTTPD	1.1	15	0.002
http	HP-ChaiServer	3.0	15	0.002
http	GeoVision GeoHttpServer for webcams		15	0.002
http	EPSON-HTTP	1.0	15	0.002
http	Dell Laser Printer 1700n http config		15	0.002
http	Boa HTTPd	0.94.13	15	0.002