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The subnet mask 255.255.255.0 address is the most common subnet mask used on computers connected to Internet Protocol (IPv4) networks. Besides its use on home network routers, you might also encounter this mask on network professional certification exams such as the CCNA.
If you've poked around the network settings on your router or computer, you've likely seen this number: 255.255.255.0. If so, you've seen a very common subnet mask for simple home networks. Like IPv4 addresses, subnet masks are 32 bits.
A subnet mask of 255.255.255.0 would give you lots of networks (2 16) and 254 hosts. A subnet of 255.255.0.0 would give you lots of hosts (approx 2 16 ) and 256 networks. A3 – the network has 8 bits and so does the node component.
This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.
Here, our subnet mask is 255.255.255.0. This can also be written as a /24 network mask. To understand the IP subnetwork boundaries, let's look at the IP address and subnet mask for our destination device:
It does some binary mathematics using its subnet mask of 255.255.255.0, sees the device address "15" (the rest of the IP address indicates the network), and calculates which subnet the packet should go to.
One can represent the IP address and subnet mask as: Subnet masks are vital to the process of subnetting. With minor adjustments in the subnet mask, you can assign the available IP addresses within a network. For example, a household home network has a standard subnet mask of 255.255.255.0.