Registro IPv4
host: fastmail.edu.pl
class: IN
ttl: 300
type: A
ip: 104.21.40.101

Registro IPv4
host: fastmail.edu.pl
class: IN
ttl: 300
type: A
ip: 172.67.184.88

Servidores DNS Principal (mname) y Secundario (rname)
host: fastmail.edu.pl
class: IN
ttl: 1800
type: SOA
mname: carl.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2418332043
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800