$TTL 2d
@  IN SOA  ns.tinycloud.   admin.tinycloud. (
                                2019081002      ; serial
                                3h              ; refresh
                                1h              ; retry
                                1w              ; expiry
                                1d )            ; minimum
17.168.192.in-addr.arpa.       IN NS     ns.tinycloud.

1.17.168.192.in-addr.arpa.     PTR    router.tinycloud.
2.17.168.192.in-addr.arpa.     PTR    secondwhite.tinycloud.

11.17.168.192.in-addr.arpa.    PTR    firstblue.tinycloud.
12.17.168.192.in-addr.arpa.    PTR    firstbrown.tinycloud.
13.17.168.192.in-addr.arpa.    PTR    firstgreen.tinycloud.
14.17.168.192.in-addr.arpa.    PTR    firstmagenta.tinycloud.
15.17.168.192.in-addr.arpa.    PTR    firstorange.tinycloud.
16.17.168.192.in-addr.arpa.    PTR    firstred.tinycloud.
17.17.168.192.in-addr.arpa.    PTR    firstwhite.tinycloud.
21.17.168.192.in-addr.arpa.    PTR    secondblue.tinycloud.
22.17.168.192.in-addr.arpa.    PTR    secondbrown.tinycloud.
23.17.168.192.in-addr.arpa.    PTR    secondgreen.tinycloud.
24.17.168.192.in-addr.arpa.    PTR    secondmagenta.tinycloud.
25.17.168.192.in-addr.arpa.    PTR    secondorange.tinycloud.
26.17.168.192.in-addr.arpa.    PTR    secondred.tinycloud.