Overview of services running on Port 53 UDP.
~15.0 Million 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
domain	ISC BIND	6839371	45.603
domain		3256813	21.715
no match	-/-	3235247	21.572
domain	dnsmasq	814877	5.433
domain	NSD	278482	1.857
domain	pdnsd or Tor DNSPort	184561	1.231
domain	PowerDNS	128424	0.856
domain	Microsoft DNS	101339	0.676
domain	NetWare dnsd	47060	0.314
domain	Aethra SV1242 WAP	34238	0.228
domain	TinyDNS	34197	0.228
domain	MyDNS	16394	0.109
domain	Unbound	14177	0.095
domain	MaraDNS	9417	0.063
netbios-ssn		992	0.007
socks5		470	0.003
secure-socket	CA Secure Socket Adapter	386	0.003
audioworks	AudioWorks sound server	327	0.002
nagios-nsca	Nagios NSCA	180	0.001
https-dns	HTTPS-DNS HTTPS-over-DNS tunnel	171	0.001
domain	Netgear ProSafe FVS318v3 firewall named	145	0.001
domain	Aruba 3400 Mobility Controller named	140	0.001
domain	Incognito DNS Commander	131	0.001
mongodb	MongoDB	53	0.0
landesk-rc	Novell Zen Remote Desktop	33	0.0
nstx	NSTX IP-over-DNS tunnel	18	0.0