8/6/2023 0 Comments Another term for subnet maskThis network can be used on multiple sites at the same time because they are private and not allowed to be used on the Internet. So, in the IPv4 address space, we have a few reserved blocks of addresses which are meant to be used locally on a private network, e.g. NAT or in this case PAT works by letting multiple private adresses share a single public IP address by mapping to a port number. Problem 2 is that, even with subnetting, we have way too few addresses for every device to get its own, which is why we've got NAT. So by decreasing the number of addresses on each network, you can increase the number of networks. Subnetting is basically moving the boundary between the host and network part of the address. ![]() Even more so with a class A network.Īlso most of the time we require many smaller networks with just a few hosts which is why we subnet. Historically it was not recommended to have more than around 250 IPs on the same network because of broadcasts flooding the network which meant that class B networks, which have a default subnet mask of 255.255.0.0 with 16 bits for hosts, have way too many addresses for a single network. With 8 bits for hosts you could have 2^8 - 1 = 254 IP addresses that are part of the same network. ![]() A class C address had a default subnet mask of 255.255.255.0 meaning 24 bits decide which network and the last 8 bits are for the host. Problem 1: Previously IP addresses were divided into classes A, B and C. NAT and subnetting solve two different problems.
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