[함수] Netmask bit 계산 (netmask → bit)

CREATE OR REPLACE FUNCTION to_maskfromnumber(number_in IN number)
RETURN varchar2
IS
netmask varchar2(17);

BEGIN
netmask := to_ipfromnumber(4294967295-power(2,32-number_in)+1);
RETURN netmask;
END;
/