Servidores DNS Principal (mname) y Secundario (rname)
host: lib.co.us
class: IN
ttl: 21600
type: SOA
mname: ns1.localitymanagement.us
rname: abhishek\.mitra.impetus.com
serial: 2025061846
refresh: 86400
retry: 86400
expire: 86400
minimum-ttl: 86400