Detailed calculation of the IP subnetting
Base IP Address: 192.168.1.0 (Class C private IP address)
Subnet Mask: 255.255.255.0 (Class C subnet mask)
Normal Area: 30 hosts
Gaming / Tournament Area : 20 hosts
Staff : 4 hosts
Type of Subnetting : VLSM (Variable Length Subnet Mask)
Calculate Subnets Based on Host Requirements:
The largest subnet is normal area with 30 hosts, so we do subnetting for normal area first.
Subnet 1 (Normal Area - 30 Hosts):
Required Hosts: 30 hosts
Quantity of host = 2ᴴ - 2 ≈ 30
2ᴴ = 2⁵ (equal or more than 30)
H = 5, 2⁵ – 2 >= 32 - 2 >= 30
Subnet Mask: 255.255.255.224
32 – 5 = 27
Since we use 5 bits for hosts, leaving 27 bits for the network,
1st subnet: 11000000.10101000.00000001.000XXXXX
2nd subnet (for next subnetting): 11000000.10101000.00000001.001XXXXX
Subnet 1:
NN: 11000000.10101000.00000001.00000000
IP Range: 11000000.10101000.00000001.00000001 - 11000000.10101000.00000001.00011110
BN: 11000000.10101000.00000001.00011111
Subnet 2 (Tournament Area - 20 Hosts):
Required Hosts: 20 hosts
Quantity of host = 2ᴴ - 2 ≈ 20
2ᴴ = 2⁵(equal or more than 30)
H = 5, 2⁵ – 2 >= 32 - 2 >= 20
32 – 5 = 27
Since we use 5 bits for hosts, leaving 27 bits for the network,
1st subnet: 11000000.10101000.00000001.001XXXXX
2nd subnet (for next subnetting): 11000000.10101000.00000001.010XXXXX
Subnet 2:
NN: 11000000.10101000.00000001.00100000
IP Range: 11000000.10101000.00000001.00100001 - 11000000.10101000.00000001.00111110
BN: 11000000.10101000.00000001.00111111
Subnet 3 (Staff - 4 Hosts):
Required Hosts: 4 hosts
Quantity of host = 2ᴴ - 2 ≈ 4
2ᴴ = 2³
H = 3, 2³ – 2 = > 8 – 2 >= 4
32 – 3 = 29
Since we use 3 bits for hosts, leaving 29 bits for the network,
1st subnet: 11000000.10101000.00000001.01000XXX
2nd subnet (for next subnetting): 11000000.10101000.00000001.01001XXX
Subnet 3:
NN: 11000000.10101000.00000001.01000000
IP Range: 11000000.10101000.00000001.01000001 - 11000000.10101000.00000001.01000110
BN: 11000000.10101000.00000001.01000111
The IP Address Table:
Subnet | Subnet Address | Subnet Mask (/X) | First Host Address | Last Host Address | Broadcast Address |
Subnet 1 (Normal Area) | 192.168.1.0 | /27 | 192.168.1.1 | 192.168.1.30 | 192.168.1.31 |
Subnet 2 (Tournament Area) | 192.168.1.32 | /27 | 192.168.1.33 | 192.168.1.62 | 192.168.1.63 |
Subnet 3 (Staff) | 192.168.1.64 | /29 | 192.168.1.65 | 102.168.1.70 | 192.168.1.71 |
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