i want to check only UNBLOCKED CUSTOMERS

Dear sd gurus

Before posting this question i have searched in google but not able to fine it

Generally if we want to know only blocked customers list we have to write one program s_alr_87012179

Or we can check in kna1 but here we can get blocked customers list based on

1. order block 2) delivery block   3) posting block  4) payment block like this

Dear now if i want to check only UNBLOCKED CUSTOMERS ( only not blocked customers ) ,how to check

i have tried in VCUST T.code But i coudnt able to find

If it is basic question plz forgive me ... Thanks to mentors