1. watchA
lame delegation
2. whois
3. history
www.amex. 3600 IN NS gw4.aexp.com. www.amex. 3600 IN NS gw5.aexp.com. www.amex. 3600 IN NS gw.aexp.com. www.amex. 3600 IN NS gw3.aexp.com. $ dig -t a www.americanexpress @gw5.aexp.com ; <<>> DiG 9.11.3-1ubuntu1.12-Ubuntu <<>> -t a www.americanexpress @gw5.aexp.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 18864 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ; COOKIE: c5adf15986b105065efb56b75fdb10d6fc02dba5b9c743e9 (good) ;; QUESTION SECTION: ;www.americanexpress. IN A ;; Query time: 187 msec ;; SERVER: 148.173.97.12#53(148.173.97.12) ;; WHEN: Thu Dec 17 17:03:34 JST 2020 ;; MSG SIZE rcvd: 76