Registro IPv4
host: yy.cm
class: IN
ttl: 90
type: A
ip: 45.138.68.51

Servidores DNS Principal (mname) y Secundario (rname)
host: yy.cm
class: IN
ttl: 1800
type: SOA
mname: elaine.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2388099253
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800