Extracting octets from an inet column

Hi,

I'm trying to find a method I can use to extract octets from an inet
value.  I have a column that contains host addresses, which are all
currently stored as "/32."  I'd like to be able to extract the third and
fourth octets of the address individually (due to the way we assign
IP addresses on our campus, this would be a useful thing to do).
This could be complete brain freeze, but I can't find a way to do it.

I've looked at trying to change the mask length from "/32" to "/24",
which would then let me get at the last octet using the host()
function.  I saw a reference to a set_masklen() function in 7.2, but
I'm using 7.1.2.  I looked at trying to convert a value to text,
manipulate the text, and then convert it back to an inet, but can't
find a magic combination to do this.

I also failed to find a way to access the raw byte values as
something like bit strings, which I could then play with.

Can anyone point me in the right direction?

Thanks!
Blair


=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Blair Vessey                         VESSEY@UPEI.CA
Systems Manager, University of Prince Edward Island
Charlottetown, Prince Edward Island, Canada C1A 4P3
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"An ounce of perception, a pound of obscure" - Rush