Registro IPv4
host: first1.us
class: IN
ttl: 3600
type: A
ip: 74.208.236.127

Servidores DNS Principal (mname) y Secundario (rname)
host: first1.us
class: IN
ttl: 21600
type: SOA
mname: ns1045.ui-dns.com
rname: hostmaster.1und1.com
serial: 2017060111
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 600

Servidor de Correo
host: first1.us
class: IN
ttl: 3600
type: MX
pri: 10
target: mx00.ionos.com

Servidor de Correo
host: first1.us
class: IN
ttl: 3600
type: MX
pri: 10
target: mx01.ionos.com

Información TXT
host: first1.us
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:_spf-us.ionos.com ~all
entries: Array