We have (000000) which is equal to 6 bits. Since the 2 bits (11 which identifies the network(subnets)) has been used, we calculate the number of valid hosts from the remainder 0’s. Step 2: Calculate the number of Hosts per subnet Let us solve this interesting question together by following these steps įrom the finger table 1.1, /26 is Finger 2 which sits on block size 64 which has the Mask Value of 192( 11000000).Ģ bits are used to identify the subnet and so to find the total subnets available, we simply raise 2 to the power of 2 (2^2) and you will find the result is 4 subnets. Subnetting Question 3:How many subnets and hosts per subnet can you get from the network 172.18.0.0/26? Since 172.18.41.128 is not within the valid host range of the first subnet block, it is clearly going to be on the second subnet block of Subnet ID 172.18.41.128. Remember that the block size indicates that the subnet address 172.18.41.0 is part of the block size count. Starting from 0, the first subnet address will be 172.18.41.0 with Valid Start Host as 172.18.41.1 and Valid End Host as 172.18.41.126 with 172.18.41.127 being the broadcast address. So starting from 0, our address 172.18.41.128 would be on the second subnet block 172.18.41.128. Since the block size is 128, this means that the increments for this subnet will be 128. Step 3: Identify Subnet Block of IP Address Where did we get + 1 from? This is the finger position from our subnet table. The known 3 octets forms a prefix of () = /24 + 1 = /25. From our finger table 1.1, the block size is 128 with mask value of 128(10000000). We know that the last octect in the subnet mask is 128.Ģ56 – 128 will determine which block size this belongs to. The approach for this is pretty straight forward. Subnetting Question 2: What is the last valid host on the subnetwork 172.18.41.128 255.255.255.128 Step 6 | Write down the new address based on the calculation so far Step 5 – Calculate What Subnet Mask to UseĢ56 minus the block size is what gives you the subnet mask.Ģ56 – 4 = 252 which is equal to the prefix /22 Now that we have calculated the number of subnets required, we move to the next step. From the finger table 1.1 we know that 2 raised to the power of 6 gives us 64 subnets which is more than enough for our needs. In this example you have been asked to provision 60 subnets. Step 4 – Calculate and provision the number of subnets required. Step 3 – Write down the full address with the prefix Step 2 – Write down the default subnet mask The above address belongs to the Class B IP Address Group – Class B(128-191) as 172 falls within that range of addresses. The first thing is to check what private ip address class the given address belongs to. Subnetting Question 1: We have an address 172.18.0.0 and we need 60 subnets. You are usually given a subnet address and asked to provision a number of subnets. Write down the Class it belongs to | Is it Class A, B, or C ?Īs a network engineer, as part of design or expansions you may from time to time be required to provision a number of subnets based on an Subnet ID.Firstly classify the address | This is exactly what we did in the exercise above.Step by Step Guide to Understanding IP Subnetting – The Process for Subnetting Learn this table | Finger Table 1.1 Finger How was that exercise? Let us move on to understanding subnetting with this step by step guide. Step by Step Guide to Understanding IP Subnetting -What Class does each IP below belong to? Referencing the above table, can you perform a detective work in identifying which class the following ip addresses belong? It is like knowing the Periodic Table in Chemistry. It is extremely important to remember this table as it is a required knowledge for every subnetting task you may encounter. Step by Step Guide to Understanding IP Subnetting – Private IP Address Classes Table This tutorial will take you through the best way in calculating subnetting requirements. You may not always have the subnet address or mask to identify what the ip address is. In this article on the Step by Step Guide to Understanding IP Subnetting, I attempt to start from the basics all the way to solving any subnetting questions with an approach that is reliably accurate at all times. The article also indicated provisioned subnet mask information which made it simple for the network engineer to carry out subnetting. In my previous article, I showed you a smarter way to solve subnetting questions but that was quite an intermediate approach as I expected some prior understanding.
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