1. TLD/net/surf.net

ccTLD/nl/surfnet.nl と深い関係にある。

$ dnsq ns surf.net a.gtld-servers.net

2 surf.net:
268 bytes, 1+0+5+6 records, response, noerror
query: 2 surf.net
authority: surf.net 172800 NS ns0.ja.net
authority: surf.net 172800 NS ns1.surfnet.nl
authority: surf.net 172800 NS ns2.surfnet.nl
authority: surf.net 172800 NS ns3.surfnet.nl
authority: surf.net 172800 NS ns1.zurich.surf.net
additional: ns0.ja.net 172800 A 128.86.1.20
additional: ns0.ja.net 172800 A 193.63.94.20
additional: ns0.ja.net 172800 AAAA 2001:630::8:0:0:0:14
additional: ns0.ja.net 172800 AAAA 2001:630::9:0:0:0:14
additional: ns1.zurich.surf.net 172800 A 195.176.255.9
additional: ns1.zurich.surf.net 172800 AAAA 2001:620::9:0:0:0:1103

$ dnsq ns surf.net ns1.zurich.surf.net

2 surf.net:
136 bytes, 1+5+0+0 records, response, authoritative, noerror
query: 2 surf.net
answer: surf.net 7200 NS ns3.surfnet.nl
answer: surf.net 7200 NS ns1.zurich.surf.net
answer: surf.net 7200 NS ns2.surfnet.nl
answer: surf.net 7200 NS ns1.surfnet.nl
answer: surf.net 7200 NS ns0.ja.net

$ dnsq ns surf.net ns1.zurich.surf.net

2 surf.net:
136 bytes, 1+5+0+0 records, response, authoritative, noerror
query: 2 surf.net
answer: surf.net 7200 NS ns3.surfnet.nl
answer: surf.net 7200 NS ns1.zurich.surf.net
answer: surf.net 7200 NS ns2.surfnet.nl
answer: surf.net 7200 NS ns1.surfnet.nl
answer: surf.net 7200 NS ns0.ja.net

$ dnsq ns zurich.surf.net ns1.zurich.surf.net

2 zurich.surf.net:
93 bytes, 1+0+1+0 records, response, authoritative, noerror
query: 2 zurich.surf.net
authority: surf.net 7200 SOA ns1.surfnet.nl netmaster.surfnet.nl 2014101701 28800 7200 604800 86400