$TTL 600
@   IN  SOA        acme.${hostname}. admin.acme.${hostname}. (
        2021070821 ;Serial
        3600       ;Refresh
        200        ;Retry
        1209600    ;Expire
        900        ;Negative response caching TTL
)

@               IN A    162.55.188.157
@               IN AAAA 2a01:4f8:1c1c:4121::2
@               IN NS   resolver.name.
@               IN NS   second.resolver.name.