reverse lookup example

[Pamela Rock]

The following is a sample SOA record.  The subnet mask
for this example would be 255.255.255.128.  My
question is what does the 0/24 portion of the
configuration suppose to represent?  Thank you in
advance.


0/24.152.45.42.in-addr.arpa. IN SOA host.domain.com.
root.host.domain.com. (
2005112801 ; Serial
7200       ; Refresh after 3 hours
3600       ; Retry after 1 hour
604800     ; Expire after 1 week
172800 )   ; Minimum TTL of 2 days


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