% dnsq ns info a.root-servers.net | grep -v " 28 " 2 info: 425 bytes, 1+0+6+12 records, response, noerror query: 2 info authority: info 172800 NS c0.info.afilias-nst.info authority: info 172800 NS d0.info.afilias-nst.org authority: info 172800 NS a0.info.afilias-nst.info authority: info 172800 NS a9.info.afilias-nst.info authority: info 172800 NS b0.info.afilias-nst.org authority: info 172800 NS b9.info.afilias-nst.org additional: a0.info.afilias-nst.info 172800 A 199.254.31.1 additional: a9.info.afilias-nst.info 172800 A 204.74.112.33 additional: b0.info.afilias-nst.org 172800 A 199.254.48.1 additional: b9.info.afilias-nst.org 172800 A 204.74.113.33 additional: c0.info.afilias-nst.info 172800 A 199.254.49.1 additional: d0.info.afilias-nst.org 172800 A 199.254.50.1 % dnsq ns info 199.254.31.1 | grep -v " 28 " 2 info: 425 bytes, 1+6+0+12 records, response, authoritative, noerror query: 2 info answer: info 86400 NS b0.info.afilias-nst.org answer: info 86400 NS a9.info.afilias-nst.info answer: info 86400 NS b9.info.afilias-nst.org answer: info 86400 NS a0.info.afilias-nst.info answer: info 86400 NS d0.info.afilias-nst.org answer: info 86400 NS c0.info.afilias-nst.info additional: a9.info.afilias-nst.info 86400 A 204.74.112.33 additional: b9.info.afilias-nst.org 86400 A 204.74.113.33 additional: a0.info.afilias-nst.info 86400 A 199.254.31.1 additional: b0.info.afilias-nst.org 86400 A 199.254.48.1 additional: c0.info.afilias-nst.info 86400 A 199.254.49.1 additional: d0.info.afilias-nst.org 86400 A 199.254.50.1(AAAAはgrep -v で省略)
% dig ns info @199.254.49.1 ; <<>> DiG 9.3.4-P1 <<>> ns info @199.254.49.1 ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached % dig ns info @199.254.50.1 ; <<>> DiG 9.3.4-P1 <<>> ns info @199.254.50.1 ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reachedNSに対応するAレコードもひどく多段な検索が必要だし、、、(glueがあればいいってもんじゃないでしょ)
Copyright by T.Suzuki