SQL & PL/SQL :: Search Based On Column

can we make a search based on column , actually i have one requirement where the data is stored in column as comma seperated values like below

arif,123455,123456,77777
sait,123455,123456,66666
tomm,666666,123455,123456

I want to filter only 123455 and 123456 from this list, is it possible to get a range as i want to use it as report parameters , i can do it by using like operator as below

create table prd_mast ( prd_cd varchar2(12), prd_desc varchar2(3000));
insert into prd_mast values ('1','arif,123455,123456,77777');
insert into prd_mast values ('2','sait,123455,123456,66666');

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