Registro IPv4
host: nationalstudytours.com
class: IN
ttl: 7200
type: A
ip: 208.91.197.27

Servidores DNS Principal (mname) y Secundario (rname)
host: nationalstudytours.com
class: IN
ttl: 7200
type: SOA
mname: NS51.WORLDNIC.com
rname: namehost.WORLDNIC.com
serial: 112021017
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600