Overview of services running on Port 17 UDP.
~107 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
qotd	Windows qotd	46321	42.993
no match	-/-	45842	42.549
http	lighttpd	15051	13.97
netbios-ssn		173	0.161
socks5		168	0.156
utorrent-udp	uTorrent UDP listener	83	0.077
dominoconsole	Lotus Domino Console	42	0.039
http		24	0.022