# dig @1.1.1.1 +trace -x 140.131.145.63
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-25.P1.el5_11.4 <<>> @1.1.1.1 +trace -x 140.131.145.63
; (1 server found)
;; global options: printcmd
. 7598 IN NS a.root-servers.net.
. 7598 IN NS b.root-servers.net.
. 7598 IN NS c.root-servers.net.
. 7598 IN NS d.root-servers.net.
. 7598 IN NS e.root-servers.net.
. 7598 IN NS f.root-servers.net.
. 7598 IN NS g.root-servers.net.
. 7598 IN NS h.root-servers.net.
. 7598 IN NS i.root-servers.net.
. 7598 IN NS j.root-servers.net.
. 7598 IN NS k.root-servers.net.
. 7598 IN NS l.root-servers.net.
. 7598 IN NS m.root-servers.net.
;; Received 420 bytes from 1.1.1.1#53(1.1.1.1) in 3 ms
in-addr.arpa. 172800 IN NS e.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS f.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS d.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS c.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS b.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS a.in-addr-servers.arpa.
;; Received 421 bytes from 2001:503:ba3e::2:30#53(a.root-servers.net) in 168 ms
140.in-addr.arpa. 86400 IN NS u.arin.net.
140.in-addr.arpa. 86400 IN NS r.arin.net.
140.in-addr.arpa. 86400 IN NS z.arin.net.
140.in-addr.arpa. 86400 IN NS y.arin.net.
140.in-addr.arpa. 86400 IN NS arin.authdns.ripe.net.
140.in-addr.arpa. 86400 IN NS x.arin.net.
;; Received 184 bytes from 2001:dd8:6::101#53(e.in-addr-servers.arpa) in 159 ms
131.140.in-addr.arpa. 172800 IN NS dns.ntu.edu.tw.
131.140.in-addr.arpa. 172800 IN NS dns5.ntu.edu.tw.
;; Received 92 bytes from 2001:500:14:6050:ad::1#53(u.arin.net) in 38 ms
dig: couldn't get address for 'dns5.ntu.edu.tw': not found