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Learn what a subnet mask is, how it works, and its role in IP networks. Explore uses, benefits, and tools for managing subnet masks effectively. Subnet Mask is a 32-bit number that is used to partition IP addresses into a network ID and a host ID (network and host bits). Subnet masks are used by TCP/IP services and applications to determine whether a given IP address on an internetwork is a local network address or a remote network address. This web page provides a tool to calculate subnet mask, network address, usable host range, and other information for IPv4 and IPv6 networks. It also explains the concepts of subnetting, CIDR, and IP classes with examples and tables. Learn what subnet mask is, how to use it, and why it is important for IP addressing. Find out the methods, formulas, and examples of subnetting and subnet masking.
