Zone file - reverse lookup

[COS365]

I'm trying to add some of my local workstations to nxfilter so I can do a reverse IP lookup. I presume I can do this?
I can ping ns1.example.com but nslookup ns2.example.com fails.
Zone file attached.

[support200]

Seems like there are some errors in your zone file. ChatGPT gave me this:

@       IN  SOA     ns1.example.com. hostmaster.example.com. (
                2025011801 ; serial
                900        ; refresh
                600        ; retry
                604800     ; expire
                86400      ; minimum TTL
            )
        IN  NS      ns1.example.com.
        IN  A       192.168.0.1

; server host definitions
ns1     IN  A       192.168.0.1
www     IN  A       192.168.0.2

; reverse DNS (example for 192.168.0.1)
1.0.168.192.in-addr.arpa. IN  PTR  ns1.example.com.
2.0.168.192.in-addr.arpa. IN  PTR  www.example.com.