1.
ANSI point codes are divided into three parts:
NetworkIndicator(8 bit)1 ? NetworkCluster(8 bit) - NetworkClusterMember(8 bit)
example: 240-012-140

2.
ITU International point codes are divided into three parts:
Zone(3 bits) - Area(8 bits) - ID(3 bits)
example: 04-208-06

3.
ITU National Point Codes have two possible values:
NNNNN or M1-M2-M3-M4
where:

NNNNN = A number in the range 0-16383 (14 bits)
M1 = 0-7 (3 bits)
M2 = 0-15 (4 bits)
M3 = 0-15 (4 bits)
M4 = 0-7 (3 bits)

example: 15045  or  003-010-012-005

4.
ITU National 24 bit point codes are divided into three parts:
Main Signaling Area(8 bits) ? Sub Signaling Area(8 bits) ? Signaling Point(8 bits)
example: 140-123- 028