Appendix CIP Netmask

IP Netmask or Subnet Mask is a 32-bit pattern of ones and zeros used to determine network portion of an IP address from the host portion of the IP address. Subnet mask is a network ID that is created by borrowing bits from host portion of IP address and using them as part of a network ID. The table below shows a default subnet mask for address Classes A, B, and C. Each bit that is set to "1" in the subnet mask corresponds to the bit in the IP address that is to be used as the network ID. Each bit that is set to "0" in the subnet mask corresponds to a bit in the IP address that is to be used as the host ID.

 

Address Class

 

 

 

Mask Binary Value

 

 

Mask Decimal Value

 

 

 

 

 

 

 

 

 

 

 

 

11111111

00000000

00000000

00000000

 

or Dotted Notation

 

 

 

Class A

 

255.0.0.0

 

 

 

 

 

 

 

Class B

11111111

11111111

00000000

00000000

 

255.255.0.0

 

 

 

 

 

Class C

11111111

11111111

11111111

00000000

 

255.255.255.0

 

 

 

 

If your network requires more network ID’s, you can extend the default subnet mask to

include additional bits from the host ID. This allows for additional network ID’s within the

network. The table below shows some examples of subnet masks and bits moved from

the hosts ID to create a new subnet.

 

 

 

 

 

 

 

 

 

 

 

Mask Dotted Notation

 

 

 

Mask Binary

 

 

 

Mask Bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11111111

Class A

00000000

 

 

 

 

 

 

 

255.0.0.0 (Default)

 

 

00000000

00000000

 

 

0

 

 

 

255.192.0.0

 

 

 

11111111

11000000

00000000

00000000

 

 

2

 

 

 

255.224.0.0

 

 

 

11111111

11100000

00000000

00000000

 

 

3

 

 

 

255.240.0.0

 

 

 

11111111

11110000

00000000

00000000

 

 

4

 

 

 

255.248.0.0

 

 

 

11111111

11111000

00000000

00000000

 

 

5

 

 

 

255.252.0.0

 

 

 

11111111

11111100

00000000

00000000

 

 

6

 

 

 

255.254.0.0

 

 

 

11111111

11111110

00000000

00000000

 

 

7

 

 

 

255.255.0.0

 

 

 

11111111

11111111

00000000

00000000

 

 

8

 

 

 

255.255.128.0

 

 

 

11111111

11111111

10000000

00000000

 

 

9

 

 

 

255.255.192.0.0

 

 

 

11111111

11111111

11000000

00000000

 

 

10

 

 

 

 

……………

 

 

 

.. .. . .. . . .. . . . .. .. .. .. . . .. . . .. . .

 

 

.

 

 

 

255.255.255.252

 

 

 

11111111

11111111

11111111

11111100

 

 

22

 

 

 

 

255.255.0.0 (Default)

 

 

11111111

Class B

 

 

 

 

0

 

 

 

 

 

 

11111111

00000000

00000000

 

 

 

 

 

255.255.192.0

 

 

 

11111111

11111111

11000000

00000000

 

 

2

 

 

 

 

……………

 

 

 

.. . .. .. . .. . . . .. . . .. .. . .. .. . .. . . .

 

 

.

 

 

 

255.255.255.252

 

 

 

11111111

11111111

11111111

11111100

 

 

14

 

 

 

 

255.255.255.0 (Default)

 

 

11111111

Class C

 

 

 

 

0

 

 

 

 

 

 

11111111

11111111

00000000

 

 

 

 

 

255.255.255.192

 

 

 

11111111

11111111

11111111

11000000

 

 

2

 

 

 

 

………………….

 

 

 

.. . .. .. . .. . . . .. . . .. .. . .. .. . .. . . .

 

 

.

 

 

 

255.255.255.254

 

 

 

11111111

11111111

11111111

11111100

 

 

6

 

 

 

To determine the number of valid hosts ID’s remaining after subnetting, use the following

 

equation: 2n – 2, where n is the number of octet digits left after the subnet mask.

 

 

 

 

82

Page 88
Image 88
Omega Speaker Systems wi Series manual Address Class Mask Binary Value Mask Decimal Value

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