Alternative Format
There are two ways an IP address can be written;
192.168.3.55 255.255.255.0
192.168.3.55/24 - which identifies that the first 24 bits (3 octets) are the Network ID
Both addresses are the same they are just written in a different format.
Calculating IP Address Range
If we are to include an address range within the Firewall option, it is necessary to:
Identify the IP address range
Calculate the subnet mask
The following tables show the format for each Class (A, B, C), they include the IP address and
number of bits allocated to the network address, equivalent subnet mask, IP address range and
number of hosts.
Use these tables to assist you in entering the correct information.
Class A table
The table below shows the address ranges for a Class A network. To identify the correct
information, locate the Host address that best fits your requirements and enter the IP address
and subnet or the IP address and number of bits in the Firewall option (10.1.1.1/10).
Example IP address
10.1.1.1/8
10.1.1.1/9
10.1.1.1/10
10.1.1.1/11
10.1.1.1/12
10.1.1.1/13
10.1.1.1/14
10.1.1.1/15
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Equivalent Network address
255.0.0.0
255.128.0.0
255.192.0.0
255.224.0.0
255.240.0.0
255.248.0.0
255.252.0.0
255.254.0.0
Host Addresses
10.1.1.0 – 10.255.255.255
10.1.1.0 – 10.127.255.255
10.1.1.0 – 10.63.255.255
10.1.1.0 – 10.31.255.255
10.1.1.0 – 10.15.255.255
10.1.1.0 – 10.7.255.255
10.1.1.0 – 10.3.255.255
10.1.1.0 – 10.1.255.255
Dedicated Micros
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