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Calcimator

Subnet Calculator

Calculate subnet mask, network address, broadcast address, usable host range, and CIDR notation for any IP address.

Inputs

bits

Results

Network Address

192.168.1.0

Broadcast Address192.168.1.255
Subnet Mask255.255.255.0
Wildcard Mask0.0.0.255
Usable Hosts254
First Usable Host192.168.1.1
Last Usable Host192.168.1.254
IP ClassC
Address TypePrivate
IP (Binary)11000000.10101000.00000001.01100100
How to Use This Calculator
  1. Enter the four IP Address Octets (0–255 each) to form your IPv4 address (e.g., 192.168.1.100).
  2. Set the CIDR Prefix Length — /24 is the most common LAN size (254 usable hosts), /16 covers a larger campus.
  3. Review the Network Address and Broadcast Address that bound your subnet.
  4. Check Usable Hosts to confirm the subnet can accommodate your devices, and note the First and Last Usable Host IPs.
  5. Use IP Class and Address Type (Private/Public) to verify the address falls in the correct range for your deployment.

What each input means

IP Octet 1
First octet of the IP address.
IP Octet 2
Second octet of the IP address.
IP Octet 3
Third octet of the IP address.
IP Octet 4
Fourth octet of the IP address.
CIDR Prefix Length
CIDR notation subnet mask prefix length.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    IP Octet 1 = 192, IP Octet 2 = 168, IP Octet 3 = 1, IP Octet 4 = 100 = 5 input(s) provided
  2. Calculate Network Address
    Network Address
    192.168.1.0 = 192.168.1.0
  3. Calculate Broadcast Address
    Broadcast Address
    192.168.1.255 = 192.168.1.255
  4. Calculate Subnet Mask
    Subnet Mask
    255.255.255.0 = 255.255.255.0

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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