Setup guide
Class A Address Range
This identifies the range of network address that are within the Class A address range; 0 – 126.
11.1004
Subnet Mask
This shows that the first octet masked by the subnet which identifies the Network ID and the
remaining 3 octets are the Host ID’s. Which means that we can have 127 (0 to 126) networks each
with up to 16,777,216 hosts.
11.1005
Alternative Format
There are two ways an IP address can be written;
10.1.1.23 255.0.0.0.
10.1.1.23/8 - which identifies that the first 8 bits (octet) is the Network ID.
Both addresses are the same they are just written in a different format.
11.1006
Class B
A Class B network can be seen as being a medium sized network offering more network ID’s than
a Class A but less host ID’s, we can see that the subnet ‘masks’ out the network portion of the IP
address.
Class B Address Range Subnet Mask Alternative Format
128.1.x.x 255.255.0.0 128.1.x.x/16
191.255.x.x 255.255.0.0 191.255.x.x/16
11.1007
Class B Address Range
This identifies the range of network address that are within the Class B address range; 128.1
– 191.255.
11.1008
Subnet Mask
This shows that the first two octets are masked by the subnet which identifies the Network ID and
the remaining 2 octets are the Host ID’s.
11.1009
Alternative Format
There are two ways an IP address can be written;
132.1.1.23 255.255.0.0.
132.1.1.23/16 - which identifies that the first 16 bits (2 octets) are the Network ID.
Both addresses are the same they are just written in a different format.
11.101
Class C
A Class C network is the most commonly used class, and is available for small to medium sized
business. The allocated network portion is the first three octets, with the remaining octet being the host
address.
Class C Address Range Subnet Mask Alternative Format
192.0.1.x 255.255.255.0 192.0.1.x/24
223.255.255.x 255.255.255.0 223.255.255.x/24
11.1011
Class C Address Range
This identifies the range of network address that are within the Class C address range; 192.0.0
– 223.255.255.
11.1012
Subnet Mask
This shows that the first three octets are masked by the subnet which identifies the Network ID and
the remaining octet is the Host ID’s.
11.1013