CREATE OR REPLACE FUNCTION "public"."expand_network" (net cidr) RETURNS SETOF inet AS
$body$
DECLARE
  i integer;
  top integer;
  curinet inet;
BEGIN
  top := ( 2  << ( 31  - masklen(net))) -  2 ;
  curinet := net & netmask(net);
  for i in  1 ..top loop
    curinet := curinet +  1 ;
    return next curinet;
  end loop;
END;
$body$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST  100  ROWS  1000 ;

db=# select * from expand_network('192.168.0.0/29');
 expand_network
----------------
  192 . 168 . 0 . 1 
  192 . 168 . 0 . 2 
  192 . 168 . 0 . 3 
  192 . 168 . 0 . 4 
  192 . 168 . 0 . 5 
  192 . 168 . 0 . 6 
( 6  rows)