+A network mask, often called [Subnet Mask](/wiki/Subnet_Mask), is a 32-bit number that divides an [IP Address](/wiki/IP_Address) into its network and host components. It establishes the boundary, allowing devices to determine if a destination is local or needs to be routed across networks.
+## See also
+- [IP Address](/wiki/IP_Address)
+- [Subnet](/wiki/Subnet)
+- [Routing](/wiki/Routing)
... 1 more lines