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These IP addresses are divided into classes. The most common of them are classes A, B, and C. Classes D and E exist, but aren't used by end users. Each of the address classes has a different default subnet mask. You can identify the class of an IP address by looking at its first octet. Class A networks use a default subnet mask of The address Its first octet is 10, which is between 1 and , inclusive.
Class B networks use a default subnet mask of Its first octet is , which is between and , inclusive. Class C networks use a default subnet mask of In some scenarios, the default subnet mask values don't fit the organization needs for one of the following reasons:. It becomes necessary as you reconcile the logical address scheme of the Internet the abstract world of IP addresses and subnets with the physical networks in use by the real world. A system administrator who is allocated a block of IP addresses may be administering networks that aren't organized in a way that easily fits these addresses.
Each of these three networks has 50 hosts. You are allocated the class C network For illustration, this address is actually from a range that isn't allocated on the Internet.
It means that you can use the addresses Two addresses that can't be used in your example are The zero address is invalid because it's used to specify a network without specifying a host. The address in binary notation, a host address of all ones is used to broadcast a message to every host on a network. Just remember that the first and last address in any network or subnet can't be assigned to any individual host.
You should now be able to give IP addresses to hosts. It works fine if all computers are on a single network. However, your computers are on three separate physical networks.
Instead of requesting more address blocks for each network, you divide your network into subnets that enable you to use one block of addresses on multiple physical networks. In this case, you divide your network into four subnets by using a subnet mask that makes the network address larger and the possible range of host addresses smaller. In other words, you are 'borrowing' some of the bits used for the host address, and using them for the network portion of the address.
The subnet mask It works because in binary notation, If you have an idea for improving our products or want to vote on other user ideas so they get prioritized, please submit your feedback on our Community platform. And if you have any questions, please feel free to ask in the Community or contact our Technical Support team. Ethernet adapter Ethernet Here is the configuration of a network interface card NIC on the system, and if there is more than one, it will show all the NICs.
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