DNS/グルーレコード/arpa TLD/arpa $ dnsq ns 128.in-addr.arpa a.root-servers.net 2 128.in-addr.arpa: 410 bytes, 1+0+6+12 records, response, noerror query: 2 128.in-addr.arpa authority: in-addr.arpa 172800 NS a.in-addr-servers.arpa authority: in-addr.arpa 172800 NS b.in-addr-servers.arpa authority: in-addr.arpa 172800 NS c.in-addr-servers.arpa authority: in-addr.arpa 172800 NS d.in-addr-servers.arpa authority: in-addr.arpa 172800 NS e.in-addr-servers.arpa authority: in-addr.arpa 172800 NS f.in-addr-servers.arpa additional: a.in-addr-servers.arpa 172800 A 199.212.0.73 additional: b.in-addr-servers.arpa 172800 A 199.253.183.183 additional: c.in-addr-servers.arpa 172800 A 196.216.169.10 additional: d.in-addr-servers.arpa 172800 A 200.10.60.53 additional: e.in-addr-servers.arpa 172800 A 203.119.86.101 additional: f.in-addr-servers.arpa 172800 A 193.0.9.1