If you want to query a server then you do
dig @<server>
e.g.
dig dropbox.com @203.94.243.70
I suggest that you run "dig +trace dropbox.com" and see where that
fails. It should return something like below if everything goes ok.
Mark
; <<>> DiG 9.11.0a3 <<>> +trace dropbox.com
;; global options: +cmd
. 518400 IN NS f.root-servers.net.
. 518400 IN NS d.root-servers.net.
. 518400 IN NS m.root-servers.net.
. 518400 IN NS g.root-servers.net.
. 518400 IN NS c.root-servers.net.
. 518400 IN NS i.root-servers.net.
. 518400 IN NS b.root-servers.net.
. 518400 IN NS l.root-servers.net.
. 518400 IN NS h.root-servers.net.
. 518400 IN NS a.root-servers.net.
. 518400 IN NS e.root-servers.net.
. 518400 IN NS k.root-servers.net.
. 518400 IN NS j.root-servers.net.
. 518400 IN RRSIG NS 8 0 518400 20160714050000
20160704040000 46551 . Gjt4qXWy+cQjMelzL3gB+H6uUsg8RTjo11j4Qa8AMlxKGwziBsTUAhm+
b9kgxwMTUUozV9Q2OS5La2V6ISyXDITTOGEQ1fKH7hwgboWJKSXmKD7Z
WNKv2CipQm3kktswMfRXC4Q8XQPtkvSwiR8/OyGk1OCNOY2WdOMgUdcS dM8=
;; Received 425 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms
com. 172800 IN NS l.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS m.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 86400 IN DS 30909 8 2
E2D3C916F6DEEAC73294E8268FB5885044A833FC5459588F4A9184CF C41A5766
com. 86400 IN RRSIG DS 8 1 86400 20160714050000
20160704040000 46551 . Hdb/jGjnJ4utS8YCLGDK5yCZnmfIJPENlANfFUMn7nS1veWXx2kHOI8F
oVHLU9Go6mj52lN4uCj/2/XyaXzrAHt8xBS0MWhxLSEAczvW7k68JJPy
Fb6a+I7+uF3LJBKBNI7FlCdgKGfYGwV7yO5XuUIwevXHTrPhBBDPajrn drk=
;; Received 735 bytes from 2001:7fe::53#53(i.root-servers.net) in 293 ms
dropbox.com. 172800 IN NS ns-564.awsdns-06.net.
dropbox.com. 172800 IN NS ns-315.awsdns-39.com.
dropbox.com. 172800 IN NS ns-1162.awsdns-17.org.
dropbox.com. 172800 IN NS ns-1949.awsdns-51.co.uk.
CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN NSEC3 1 1 0 -
CK0Q1GIN43N1ARRC9OSM6QPQR81H5M9A NS SOA RRSIG DNSKEY NSEC3PARAM
CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN RRSIG NSEC3 8 2 86400
20160709045353 20160702034353 34745 com.
S9l1MzClsJ1yLt7UjxAHbHxRL6f5M1FjpUfPQREISa9C29+Fh5PX75rN
NlxIu7aJLU/G8aTc/sSbUrded6oPeAE0ky1lZx+kGYJqYrgzMdJQGVgJ
tg/p72hZ2AudJukGJWmtUX/LKXKxhjAA7qeOx6TEhqSW0CKpaiwRZ25z 64o=
D2AK06CHKHVA7I11C8SK0VH3MDSIGQP2.com. 86400 IN NSEC3 1 1 0 -
D2ALCBL518L0NIS8TSJNFLE2QCPJO7D7 NS DS RRSIG
D2AK06CHKHVA7I11C8SK0VH3MDSIGQP2.com. 86400 IN RRSIG NSEC3 8 2 86400
20160710050838 20160703035838 34745 com.
o686EmGnyZcZKpfJKluN9LFsfuQ4MXeXZLZ6lPIhn4xNVIRvEjdJwy85
v4j+i2O9CIoAVZPeL/tcPZBUVhPLNjokO9EPgCWv4wUjmmWlkBvmwvgt
ZUDrilsmmMS/7CFVU34b5qYaprI0YMANguTbkn6ZPpV3H/KqLQjS+PAP nso=
;; Received 694 bytes from 192.12.94.30#53(e.gtld-servers.net) in 319 ms
dropbox.com. 60 IN A 108.160.172.238
dropbox.com. 60 IN A 108.160.172.206
dropbox.com. 172800 IN NS ns-1162.awsdns-17.org.
dropbox.com. 172800 IN NS ns-1949.awsdns-51.co.uk.
dropbox.com. 172800 IN NS ns-315.awsdns-39.com.
dropbox.com. 172800 IN NS ns-564.awsdns-06.net.
;; Received 209 bytes from 205.251.196.138#53(ns-1162.awsdns-17.org) in 100 ms
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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