Registro IPv4
host: calculus-tutor.com
class: IN
ttl: 448
type: A
ip: 208.91.197.127

Servidores DNS Principal (mname) y Secundario (rname)
host: calculus-tutor.com
class: IN
ttl: 448
type: SOA
mname: NS29.WORLDNIC.com
rname: namehost.WORLDNIC.com
serial: 108041522
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600