1. whois
$ dig -t ns tmaeno.com @dns01.muumuu-domain.com. ; <<>> DiG 9.18.12-0ubuntu0.22.04.2-Ubuntu <<>> -t ns tmaeno.com @dns01.muumuu-domain.com. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26623 ;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1680 ; NSID: 64 6e 73 31 30 31 2e 6d 75 75 6d 75 75 2d 64 6f 6d 61 69 6e 2e 63 6f 6d ("dns101.muumuu-domain.com") ;; QUESTION SECTION: ;tmaeno.com. IN NS ;; ANSWER SECTION: tmaeno.com. 3600 IN NS dns02.muumuu-domain.com. tmaeno.com. 3600 IN NS dns01.muumuu-domain.com. ;; ADDITIONAL SECTION: dns01.muumuu-domain.com. 600 IN A 202.239.23.40 dns02.muumuu-domain.com. 600 IN A 210.152.245.173 ;; Query time: 8 msec ;; SERVER: 202.239.23.40#53(dns01.muumuu-domain.com.) (UDP) ;; WHEN: Wed Aug 02 07:47:09 JST 2023 ;; MSG SIZE rcvd: 153