Subnet Masks Explained Simply: What /24 Actually Means
Subnetting seems complex until you see the pattern. Here is the 5-minute explanation.
An IP address like 192.168.1.100 has two parts: the network portion (which network you are on) and the host portion (which device you are). The subnet mask tells you where the split is. A /24 mask (255.255.255.0) means the first 24 bits are network, the last 8 are host — giving 254 usable addresses on that network.
Common Subnet Masks
/24 (255.255.255.0): 254 hosts. The standard for home and small office networks. /16 (255.255.0.0): 65,534 hosts. Used in large corporate networks. /8 (255.0.0.0): 16 million hosts. Used by cloud providers and ISPs. /30 (255.255.255.252): 2 hosts. Used for point-to-point links between routers.
Why Subnetting Matters
Subnetting divides one large network into smaller segments. This improves security (departments cannot see each other traffic), reduces congestion (broadcast traffic stays within the subnet), and makes management easier. Every cloud architecture, corporate network, and home router uses subnetting.