Servidores DNS Principal (mname) y Secundario (rname)
host: chinaloc.net
class: IN
ttl: 86400
type: SOA
mname: dns.tsinghua.edu.cn
rname: szhu.dns.edu.cn
serial: 2012051022
refresh: 86400
retry: 7200
expire: 604800
minimum-ttl: 86400