On 20/02/15 18:49, Rob wrote:
> Why not just:
> 
> pool pool.ntp.org
> 
> That should be enough.

It returns only 2 servers (at the moment, and on my system):

root@hobbiton:~# dig pool.ntp.org

; <<>> DiG 9.9.5-3ubuntu0.2-Ubuntu <<>> pool.ntp.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7739
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 13, ADDITIONAL: 25

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;pool.ntp.org.                  IN      A

;; ANSWER SECTION:
pool.ntp.org.           146     IN      A       85.201.95.107
pool.ntp.org.           146     IN      A       213.189.188.3

;; AUTHORITY SECTION:
.                       36537   IN      NS      f.root-servers.net.
.                       36537   IN      NS      b.root-servers.net.
.                       36537   IN      NS      j.root-servers.net.
.                       36537   IN      NS      h.root-servers.net.
.                       36537   IN      NS      m.root-servers.net.
.                       36537   IN      NS      c.root-servers.net.
.                       36537   IN      NS      k.root-servers.net.
.                       36537   IN      NS      d.root-servers.net.
.                       36537   IN      NS      g.root-servers.net.
.                       36537   IN      NS      a.root-servers.net.
.                       36537   IN      NS      l.root-servers.net.
.                       36537   IN      NS      i.root-servers.net.
.                       36537   IN      NS      e.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.     300936  IN      A       198.41.0.4
a.root-servers.net.     301233  IN      AAAA    2001:503:ba3e::2:30
b.root-servers.net.     300942  IN      A       192.228.79.201
b.root-servers.net.     317560  IN      AAAA    2001:500:84::b
c.root-servers.net.     300974  IN      A       192.33.4.12
c.root-servers.net.     304383  IN      AAAA    2001:500:2::c
d.root-servers.net.     110366  IN      A       199.7.91.13
d.root-servers.net.     121013  IN      AAAA    2001:500:2d::d
e.root-servers.net.     112934  IN      A       192.203.230.10
f.root-servers.net.     101758  IN      A       192.5.5.241
f.root-servers.net.     107135  IN      AAAA    2001:500:2f::f
g.root-servers.net.     110990  IN      A       192.112.36.4
h.root-servers.net.     111111  IN      A       128.63.2.53
h.root-servers.net.     116217  IN      AAAA    2001:500:1::803f:235
i.root-servers.net.     110930  IN      A       192.36.148.17
i.root-servers.net.     114101  IN      AAAA    2001:7fe::53
j.root-servers.net.     111931  IN      A       192.58.128.30
j.root-servers.net.     118767  IN      AAAA    2001:503:c27::2:30
k.root-servers.net.     112005  IN      A       193.0.14.129
k.root-servers.net.     8040    IN      AAAA    2001:7fd::1
l.root-servers.net.     111937  IN      A       199.7.83.42
l.root-servers.net.     113806  IN      AAAA    2001:500:3::42
m.root-servers.net.     300975  IN      A       202.12.27.33
m.root-servers.net.     302827  IN      AAAA    2001:dc3::35

;; Query time: 36 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Fri Feb 20 19:57:58 CET 2015
;; MSG SIZE  rcvd: 800

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