Re: dotted quad netmask conversion

On Tue, Dec 7, 2010 at 9:17 AM, Steve Clark <sclark@netwolves.com> wrote: 

Hello All,

I am working with a postgresql database that has two columns.
One for an ip address and another for the netmask. Both of these
columns are char varying(30). I would like to convert to just
one column as inet. Any one know a slick way to convert the
dotted quad netmask, E.G. 255.255.128.0, to number of bits. I didn't
see any way directly looking at the network functions in the PG
documentation.   

select '1.2.3.4'::inet & '255.255.128.0'::inet;
or
select CAST('1.2.3.4' AS INET) & CAST('255.255.128.0' AS INET);

Be aware that CIDR representation is not as granular as netmask.

http://www.postgresql.org/docs/8.4/interactive/functions-net.html