DNS/NXDOMAIN/誤用/CNAMEについて、ここに記述してください。
$ dnsq ns www.prjorgensen.com a.gtld-servers.net 2 www.prjorgensen.com: 149 bytes, 1+0+3+3 records, response, noerror query: 2 www.prjorgensen.com authority: prjorgensen.com 172800 NS ns1.dreamhost.com authority: prjorgensen.com 172800 NS ns2.dreamhost.com authority: prjorgensen.com 172800 NS ns3.dreamhost.com additional: ns1.dreamhost.com 172800 A 64.90.62.230 additional: ns2.dreamhost.com 172800 A 208.97.182.10 additional: ns3.dreamhost.com 172800 A 66.33.205.230
1. RCODE nxdomain
SOAにあるcloudflare.netも信用ならない。
$ dnsq a www.prjorgensen.com ns1.dreamhost.com 1 www.prjorgensen.com: 150 bytes, 1+1+1+0 records, response, authoritative, nxdomain query: 1 www.prjorgensen.com answer: www.prjorgensen.com 300 CNAME www.prjorgensen.com.cdn.cloudflare.net authority: cloudflare.net 14400 SOA ns1.dreamhost.com hostmaster.dreamhost.com 2018112600 21531 1800 1814400 14400