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