Registro IPv4
host: Twich.com
class: IN
ttl: 300
type: A
ip: 75.126.100.21

Servidores DNS Principal (mname) y Secundario (rname)
host: Twich.com
class: IN
ttl: 3600
type: SOA
mname: ns1.name.com
rname: hostmaster.nsone.net
serial: 1579125896
refresh: 7200
retry: 3600
expire: 604800
minimum-ttl: 43200