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The Address Specification data block is used to contain lists of IP address range specifications and MAC 
address specifications. The Address Specification data block has a block type of 64 in the series 1 group 
of blocks.

The following diagram shows the basic structure of an Address Specification data block:

The following table describes the fields of the Address Specification data block.

Byte

0

1

2

3

Bit

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Address Specification Data Block Type (64)

Address Specification Block Length

IP Address 

Range 

Blocks

Generic List Block Type (31)

Generic List Block Length

IP Address Range Specification Data Blocks...

MAC 

Address 

Blocks

Generic List Block Type (31)

Generic List Block Length

MAC Address Specification Data Blocks...

Address 
Specification 
Data Block Type

uint32

Initiates an Address Specification data block. This value is always 

64

.

Address 
Specification 
Block Length

uint32

Total number of bytes in the Address Specification data block, 
including eight bytes for the address specification block type and 
length fields, plus the number of bytes of address specification data 
that follows.

Generic List 
Block Type

uint32

Initiates a Generic List data block. This value is always 

31

.

Generic List 
Block Length

uint32

Number of bytes in the Generic List block and encapsulated data 
blocks. This number includes the eight bytes of the generic list block 
header fields, plus the number of bytes in all of the encapsulated data 
blocks.