Registro IPv4
host: 21stcenturybooks.uk.com
class: IN
ttl: 300
type: A
ip: 104.21.18.229

Registro IPv4
host: 21stcenturybooks.uk.com
class: IN
ttl: 300
type: A
ip: 172.67.183.222

Servidores DNS Principal (mname) y Secundario (rname)
host: 21stcenturybooks.uk.com
class: IN
ttl: 1800
type: SOA
mname: ignacio.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2411326923
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Registro IPv6
host: 21stcenturybooks.uk.com
class: IN
ttl: 300
type: AAAA
ipv6: 2606:4700:3031::ac43:b7de

Registro IPv6
host: 21stcenturybooks.uk.com
class: IN
ttl: 300
type: AAAA
ipv6: 2606:4700:3034::6815:12e5