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Efficient Use of Class C Network with Subnetting

This guide explains the importance of subnetting and using proper subnet masks to efficiently utilize a Class C network. It provides examples of subnetting and calculates valid IP addresses for each network.

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Efficient Use of Class C Network with Subnetting

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  1. If we don’t subnet and use 255.255.255.0 as our subnet mask then we use all of our IP addresses on one network. This is not an efficient use of our Class C network. For each network you loose two IP address, one for the network and one for the broadcast. 11111111.11111111.11111111.00000000 = 255.255.255.0 = class C mask 11111111.11111111.11111111.11111111 = 255.255.255.255 = broadcast

  2. 192.168.100.96 255.255.255.240 192.168.100.97 thru 192.168.100.111 are valid IP address for the 96 network 255.255.255.240 = 11111111.11111111.11111111.11110000 11110000 – 96 network 11110001 11110010 11110011 11110100 11110101 11110110 11110111 11111000 11111001 11111010 11111011 11111100 11111101 11111110 11111111 - broadcast

  3. We’ll use the 192.168.100.0 network

  4. 192.168.100.0 is our network and we have 254 total IP addresses Building C – 40 users – 62 hosts – 255.255.255.192 – subnet 1 Building B – 20 users – 30 hosts – 255.255.255.224 – subnet 2 Building A – 08 users – 14 hosts – 255.255.255.240 – subnet 3 Firewall – 02 users – 04 hosts – 255.255.255.252 – subnet 4 subnet 1 192.168.100.0 0 is the network 255.255.255.192 63 is the broadcast subnet 2 192.168.100.64 64 is the network 255.255.255.192 95 is the broadcast subnet 3 192.168.100.96 96 is the network 255.255.255.240 111 is the broadcast subnet 4 192.168.100.112 112 is the network 255.255.255.252 115 is the broadcast 192.168.100.116 is the next usable network

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