Registro IPv4
host: usefulsystemsinc.com
class: IN
ttl: 300
type: A
ip: 104.21.11.76

Registro IPv4
host: usefulsystemsinc.com
class: IN
ttl: 300
type: A
ip: 172.67.148.137

Servidores DNS Principal (mname) y Secundario (rname)
host: usefulsystemsinc.com
class: IN
ttl: 1800
type: SOA
mname: ariella.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2398190666
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Registro IPv6
host: usefulsystemsinc.com
class: IN
ttl: 300
type: AAAA
ipv6: 2606:4700:3032::ac43:9489

Registro IPv6
host: usefulsystemsinc.com
class: IN
ttl: 300
type: AAAA
ipv6: 2606:4700:3035::6815:b4c