This subnet calculator helps you design and plan IP address allocation for your network. It calculates subnet information based on the network class and subnet mask you select.

How to use: Select a network class (A, B, or C), enter an IP address, and choose your desired subnet configuration. All related fields are synchronized automatically.

Key terms:

Network Class: Traditional IP classification (A: 1-126, B: 128-191, C: 192-223)
Subnet Bits: Additional bits borrowed from host portion for subnetting
Maximum Subnets: Total number of subnets possible with current configuration
Hosts per Subnet: Number of usable host addresses in each subnet
Subnet Bitmap: Visual representation showing network (n), subnet (s), and host (h) bits

Network Class Class AClass BClass C	First Octet Range
IP Address	Hex IP Address
Subnet Mask	Wildcard Mask
Subnet Bits	Mask Bits
Maximum Subnets	Hosts per Subnet
Host Address Range
Subnet ID	Broadcast Address
Subnet Bitmap 110nnnnn.nnnnnnnn.nnnnnnnn.hhhhhhhh

Networking

Subnet Calculator

Network Class

First Octet Range

IP Address

Hex IP Address

Subnet Mask

Wildcard Mask

Subnet Bits

Mask Bits

Maximum Subnets

Hosts per Subnet

Host Address Range

Subnet ID

Broadcast Address

Subnet Bitmap

About Subnet Calculator