DNS/TCP/cwidc.netについて、ここに記述してください。
$ dig +tcp -t ns trendmicro.ne.jp @a.dns.jp ; <<>> DiG 9.12.1 <<>> +tcp -t ns trendmicro.ne.jp @a.dns.jp ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14707 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 1 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;trendmicro.ne.jp. IN NS ;; AUTHORITY SECTION: trendmicro.ne.jp. 86400 IN NS ns03.cwidc.net. trendmicro.ne.jp. 86400 IN NS ns02.cwidc.net. trendmicro.ne.jp. 86400 IN NS ns01.cwidc.net. ;; Query time: 5 msec ;; SERVER: 203.119.1.1#53(203.119.1.1) ;; WHEN: Mon Apr 23 13:15:15 JST 2018 ;; MSG SIZE rcvd: 111 tmaeno@u16:~$ dig +tcp -t ns trendmicro.ne.jp @ns01.cwidc.net. ;; communications error to 141.8.224.169#53: connection reset tmaeno@u16:~$ dig +notcp -t ns trendmicro.ne.jp @ns01.cwidc.net. ; <<>> DiG 9.12.1 <<>> +notcp -t ns trendmicro.ne.jp @ns01.cwidc.net. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15740 ;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1680 ;; QUESTION SECTION: ;trendmicro.ne.jp. IN NS ;; ANSWER SECTION: trendmicro.ne.jp. 300 IN NS ns28.rookdns.com. trendmicro.ne.jp. 300 IN NS ns27.rookdns.com. ;; ADDITIONAL SECTION: ns28.rookdns.com. 300 IN A 141.8.224.170 ns27.rookdns.com. 300 IN A 141.8.224.169 ;; Query time: 158 msec ;; SERVER: 141.8.224.169#53(141.8.224.169) ;; WHEN: Mon Apr 23 13:15:32 JST 2018 ;; MSG SIZE rcvd: 126