$ORIGIN foo.example.
$TTL    1h

@       IN      SOA     ns root ( ; E-mail
                             42   ; Serial
                             2h   ; Refresh
                             1h   ; Retry
                            14d   ; Expire
                             1h ) ; Negative Cache TTL

; DNS
@       IN      NS     alpha
                NS     beta

; Mail
@               MX     10 mx1
                MX     10 mx2
                TXT    "v=spf1 +mx -all"
                SPF    "v=spf1 +mx -all"

; TLS
@ CAA 128 issue "letsencrypt.org"

alpha           A      192.0.2.1
beta            A      192.0.2.2
gamma           A      192.0.2.3
delta           A      192.0.2.4

alpha           AAAA      2001:db8::1
beta            AAAA      2001:db8::2
gamma           AAAA      2001:db8::3
delta           AAAA      2001:db8::4

; Services
www             CNAME  gamma
mx1             CNAME  delta
mx2             CNAME  gamma
ns0             CNAME  alpha
ns1             CNAME  beta

alpha           LOC    0 N 0 E
alpaa           TXT    "Null Island"