DNSSEC/dnssec-failed.org/IIJについて、ここに記述してください。
これはオープンリゾルバーか。
$ dig +dnssec dnssec-failed.org @202.232.2.39
; <<>> DiG 9.11.1-P3 <<>> +dnssec dnssec-failed.org @202.232.2.39 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18270 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags: do; udp: 4096 ;; QUESTION SECTION: ;dnssec-failed.org. IN A ;; ANSWER SECTION: dnssec-failed.org. 6424 IN A 69.252.80.75 dnssec-failed.org. 6424 IN RRSIG A 5 2 7200 20170820135541 20170809135041 3102 dnssec-failed.org. DR082+VURJkoeJATGvuqD4PgrrdmUj7AcKxlixQE4HO8ifvvBmgGK17y pK5PiieG9ahXh0IGF4FDlRJr381lU6uG57Al1Rklq072bOogaWxfgJST ktlyCNWVrh3jzUX7A0FpIvtKst0n3yuHYMw8N9ARHWCCYk+XRiRZrB0V 824= ;; Query time: 7 msec ;; SERVER: 202.232.2.39#53(202.232.2.39) ;; WHEN: Fri Aug 11 19:15:15 JST 2017 ;; MSG SIZE rcvd: 239
$ dig -x 202.232.2.39
; <<>> DiG 9.11.1-P3 <<>> -x 202.232.2.39 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62259 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;39.2.232.202.in-addr.arpa. IN PTR ;; ANSWER SECTION: 39.2.232.202.in-addr.arpa. 36000 IN PTR ns5.iij.ad.jp. ;; Query time: 527 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Fri Aug 11 19:15:33 JST 2017 ;; MSG SIZE rcvd: 81
ns5.iij.ad.jp. 86400 IN A 202.232.2.39