1. watchA
2. whois
aws.amazon.com. 627 IN NS ns-923.amazon.com. aws.amazon.com. 627 IN NS ns-932.amazon.com. aws.amazon.com. 627 IN NS ns-911.amazon.com. aws.amazon.com. 627 IN NS ns-912.amazon.com. aws.amazon.com. 627 IN NS ns-921.amazon.com. aws.amazon.com. 627 IN NS ns-931.amazon.com.
3. history
%dig -t ns signin.aws.amazon.com @ns-911.amazon.com. ~/dnsq/amazon ; <<>> DiG 9.12.1 <<>> -t ns signin.aws.amazon.com @ns-911.amazon.com. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53657 ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;signin.aws.amazon.com. IN NS ;; ANSWER SECTION: signin.aws.amazon.com. 600 IN NS ns-911.amazon.com. ;; Query time: 117 msec ;; SERVER: 52.9.140.222#53(52.9.140.222) ;; WHEN: Wed Sep 11 22:15:58 JST 2019 ;; MSG SIZE rcvd: 60 %dig -t ns signin.aws.amazon.com @ns-931.amazon.com. ~/dnsq/amazon ; <<>> DiG 9.12.1 <<>> -t ns signin.aws.amazon.com @ns-931.amazon.com. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45532 ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;signin.aws.amazon.com. IN NS ;; ANSWER SECTION: signin.aws.amazon.com. 600 IN NS ns-931.amazon.com. ;; Query time: 253 msec ;; SERVER: 52.19.138.45#53(52.19.138.45) ;; WHEN: Wed Sep 11 22:16:25 JST 2019 ;; MSG SIZE rcvd: 60
signin.aws.amazon.com. 60 IN A 52.46.159.144