ITN 101 Subnetting Shortcuts
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27 Terms
Defines the range of IP addresses that can be used within a subnet.
Subnet Mask
Represents the number of bits allocated for the network portion of the address in the format IP Address/Prefix Length.
CIDR Notation
Use the formula: /n (where n is the number of bits for the network).
Finding Subnet Mask Formula
Number of Hosts = 2^(32 - subnet bits) - 2.
Determining Number of Hosts Formula
Size = 2^(number of host bits).
Subnet Size Formula
Class A Address Range
0-127 with a subnet mask of 255.0.0.0.
128-191 with a subnet mask of 255.255.0.0.
Class B Address Range
192-223 with a subnet mask of 255.255.255.0.
Class C Address Range
Provides 4 IPs, 2 usable.
CIDR /30
Can be calculated by subtracting the unusual octet in the subnet mask from 256.
Magic Number Calculation
Add the magic number to the last octet of the starting address.
Subnet's Network Address Calculation
Binary Equivalent of 0
0000
Binary Equivalent of 1
0001
Binary Equivalent of 2
0010
Binary Equivalent of 3
0011
Binary Equivalent of 4
0100
Binary Equivalent of 5
0101
Binary Equivalent of 6
0110
Binary Equivalent of 7
0111
Binary Equivalent of 8
1000
Binary Equivalent of 9
1001
Binary Equivalent of 10
Binary Equivalent of 11
Binary Equivalent of 12
Binary Equivalent of 13
Binary Equivalent of 14
Binary Equivalent of 15
