$ORIGIN 236.205.209.in-addr.arpa.
$TTL 86400
@        IN SOA dns.wlcom.com.mx. hostmaster.wlcom.com.mx. (
                                6672
                                10800
                                3600
                                604800
                                86400
                                )

0/24          IN NS ns1.corenoc.net.
2              CNAME   2.0/24.236.205.209.in-addr.arpa.
3              CNAME   3.0/24.236.205.209.in-addr.arpa.
4              CNAME   4.0/24.236.205.209.in-addr.arpa.