; static ipv4 reverse mappings
$ORIGIN .
$TTL 38400  ; 10 hours 40 minutes
in-addr.arpa   IN SOA  dns.REPLACE_DOMAIN. admin.REPLACE_DOMAIN. (
           2018013087 ; serial
           10800      ; refresh (3 hours)
           3600       ; retry (1 hour)
           1209600    ; expire (2 weeks)
           38400      ; minimum (10 hours 40 minutes)
           )
      NS    dns1.REPLACE_DOMAIN.
      NS    dns2.REPLACE_DOMAIN.

$ORIGIN in-addr.arpa.