IP Addressing

IP addressing for the cyber cafe network (using subnetting): 

• Detailed calculation of the IP subnetting 

Our cyber cafe will have at most 20 devices. The smallest power of 2 greater than 20 is 32, which means we need a subnet that provides 32 IP addresses. 

A /27 subnet mask (255.255.255.244) provides 32 IP addresses (2^5 = 32), which includes 30 usable host addresses (32 total – 1 network address – broadcast address = 30) 

Number of Subnets : With a /27 subnet mask, a /24 network can be divided into 8 subnets. (256 IPs / 32 IPs per subnet = 8 subnets). 

Subnet	Network address	Broadcast address	Host range
1st subnet	192.168.1.0	192.168.1.31	192.168.1.1 - 192.168.1.30
2nd subnet	192.168.1.32	192.168.1.63	192.168.1.33 - 192.168.1.62
3rd subnet	192.168.1.64	192.168.1.95	192.168.1.65 - 192.168.1.94
4th subnet	192.168.1.96	192.168.1.127	192.168.1.97 - 192.168.1.126
5th subnet	192.168.1.128	192.168.1.159	192.168.1.129 - 192.168.1.158
6th subnet	192.168.1.160	192.168.1.191	192.168.1.161 - 192.168.1.190
7th subnet	192.168.1.192	192.168.1.223	192.168.1.193 - 192.168.1.222
8th subnet	192.168.1.224	192.168.1.255	192.168.1.225 - 192.168.254

Hence, our cyber cafe using the first subnet since only 20 devices using the network  

• Network address, broadcast address & host address range for whole network. 

Breakdown of Subnet 192.168.1.0/27 

 

Network address: 192.168.1.0 

Subnet mask: 255.255.255.224 

Broadcast address: 192.168.1.31 

Host range: 192.168.1.1 - 192.168.1.30