IP Subnet Calculator

Calculate IP subnet information including subnet mask, hosts per subnet, and network configuration.

IP Address Octet 1

IP Address Octet 2

IP Address Octet 3

IP Address Octet 4

Subnet Mask (CIDR)

bits

Tab to move between fields

IP Address

192.168.1.1

Subnet Mask255.255.255.0

Hosts Per Subnet254

CIDR Notation/24

How to Use This Calculator

Enter each of the four IP Address Octets (0–255) that form the IPv4 address you want to analyze.
Set the Subnet Mask (CIDR) bits — common values are 24 (/24 = 254 hosts), 16 (/16 = 65,534 hosts), or 8 (/8 = 16M+ hosts).
The calculator shows the full Subnet Mask in dotted-decimal format and CIDR notation.
Review Hosts Per Subnet to confirm the network can accommodate your required number of devices.
Use the Network Bits and Host Bits outputs to understand how the address space is divided.

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