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💻 Tech & Computing

IP Subnet & CIDR Calculator

Calculate the Network Address, Broadcast Address, Usable Host Range, and Total Hosts from any IP/CIDR block.

⚡ Instant 🆓 Free 🔒 Private
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IP Subnetting & CIDR Notation Explained

IP subnetting is the practice of dividing a larger IP network into smaller, more manageable sub-networks (subnets). The CIDR (Classless Inter-Domain Routing) notation uses a suffix like /24 to indicate how many bits of the IP address are reserved for the network portion, with the remaining bits available for individual hosts.

Key Subnet Concepts

Subnet Mask: A 32-bit number that masks the IP address to separate the network and host portions.

Network Address: The first address of a subnet — identifies the subnet itself.

Broadcast Address: The last address of a subnet — used to address all hosts on the subnet.

Usable Hosts: Total Addresses − 2 (network + broadcast)

Common CIDR Blocks

A /24 block (255.255.255.0) provides 254 usable hosts. A /16 block (255.255.0.0) provides 65,534 hosts. The smaller the CIDR number, the larger the network.