Overview of services running on Port 123 UDP.
~217 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
no match	-/-	122392	56.144
ntp	NTP	95021	43.588
ntp	Microsoft NTP	341	0.156
netbios-ssn		120	0.055
socks5		91	0.042
dominoconsole	Lotus Domino Console	23	0.011