CIDR / IPv4 Subnet Lab

Visualize IPv4 subnetting. See the exact boundary between network bits and host bits.

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Subnet Calculator
/24
/0 (Internet) /32 (Host)
SUBNET MASK
255.255.255.0
NETWORK ADDRESS
192.168.1.0
BROADCAST ADDRESS
192.168.1.255
USABLE RANGE
192.168.1.1 - 192.168.1.254
TOTAL HOSTS
256
USABLE HOSTS
254
What's happening?

An IPv4 address is 32 bits long. CIDR (Classless Inter-Domain Routing) splits these 32 bits into two parts:

  • Network Bits: Identified by the prefix length (e.g., /24 means the first 24 bits). These define the network itself.
  • Host Bits: The remaining bits (e.g., 32 - 24 = 8). These identify individual devices on that network.

Subnet Mask: A 32-bit number where all network bits are 1 and all host bits are 0.

Network Address: All host bits set to 0. Identifies the network itself.

Broadcast Address: All host bits set to 1. Used to send packets to all hosts on the network.