Subnet Calculator

IP Address

Subnet Mask

CIDR Notation

Hosts Needed

Number of Subnets

Subnet Details

Property	Value	Action

How to Use

Enter an IP address and select a subnet mask or CIDR notation
Optionally specify hosts needed or number of subnets
Click "Calculate" to view network details
Use "Copy" buttons to copy values or "Export as CSV" for all results

Examples: 192.168.1.0/24, 10.0.0.0 255.255.0.0, 172.16.5.0/28

About This Tool

Calculate network and broadcast addresses
Determine usable host ranges
Convert between subnet mask and CIDR notation
Calculate subnet sizes and split networks
Generate wildcard masks for ACLs

All calculations are performed locally in your browser for privacy.

Disclaimer: Verify all configurations before production use.