ccTLD/cz/signed.dnstester.czについて、ここに記述してください。
$ kdig -t soa signed.dnstester.cz
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 59103 ;; Flags: qr rd ra; QUERY: 1; ANSWER: 1; AUTHORITY: 3; ADDITIONAL: 6 ;; QUESTION SECTION: ;; signed.dnstester.cz. IN SOA ;; ANSWER SECTION: signed.dnstester.cz. 1800 IN SOA a.ns.nic.cz. hostmaster.nic.cz. 1257172504 10800 3600 1209600 7200 ;; AUTHORITY SECTION: signed.dnstester.cz. 1799 IN NS b.ns.nic.cz. signed.dnstester.cz. 1799 IN NS a.ns.nic.cz. signed.dnstester.cz. 1799 IN NS d.ns.nic.cz. ;; ADDITIONAL SECTION: a.ns.nic.cz. 172045 IN A 194.0.12.1 a.ns.nic.cz. 172045 IN AAAA 2001:678:f::1 b.ns.nic.cz. 172045 IN A 194.0.13.1 b.ns.nic.cz. 172045 IN AAAA 2001:678:10::1 d.ns.nic.cz. 172045 IN A 193.29.206.1 d.ns.nic.cz. 172045 IN AAAA 2001:678:1::1 ;; Received 271 B ;; Time 2015-10-14 17:50:58 JST ;; From 127.0.0.1@53(UDP) in 971.9 ms