Where does one get DNS service for one's own domain?
For those of us running our own DNS server, one generally needs to know where the Internet's root servers are located.  Here is what this server reports as the current ICANN root server zone (last updated Saturday, 27-May-2017 03:03:54 PDT):

$ORIGIN .
$TTL 86400	; 1 day
@			IN SOA	a.root-servers.net. nstld.verisign-grs.com. (
				2017052700 ; serial
				1800       ; refresh (30 minutes)
				900        ; retry (15 minutes)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)
$TTL 518400	; 6 days
			NS	a.root-servers.net.
			NS	b.root-servers.net.
			NS	c.root-servers.net.
			NS	d.root-servers.net.
			NS	e.root-servers.net.
			NS	f.root-servers.net.
			NS	g.root-servers.net.
			NS	h.root-servers.net.
			NS	i.root-servers.net.
			NS	j.root-servers.net.
			NS	k.root-servers.net.
			NS	l.root-servers.net.
			NS	m.root-servers.net.
$ORIGIN root-servers.net.
a			A	198.41.0.4
			AAAA	2001:503:ba3e::2:30
b			A	192.228.79.201
			AAAA	2001:500:84::b
c			A	192.33.4.12
			AAAA	2001:500:2::c
d			A	199.7.91.13
			AAAA	2001:500:2d::d
e			A	192.203.230.10
			AAAA	2001:500:a8::e
f			A	192.5.5.241
			AAAA	2001:500:2f::f
g			A	192.112.36.4
			AAAA	2001:500:12::d0d
h			A	198.97.190.53
			AAAA	2001:500:1::53
i			A	192.36.148.17
			AAAA	2001:7fe::53
j			A	192.58.128.30
			AAAA	2001:503:c27::2:30
k			A	193.0.14.129
			AAAA	2001:7fd::1
l			A	199.7.83.42
			AAAA	2001:500:9f::42
m			A	202.12.27.33
			AAAA	2001:dc3::35

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