← Back to Calculators
Subnet Calculator
Network Information
How to Use
Input Methods
- IP Address: Enter the network IP address
- Subnet Mask: Enter in dotted decimal notation
- CIDR: Enter prefix length (automatically converts)
Understanding Results
- Network Address: First address in the subnet
- Broadcast Address: Last address in the subnet
- First/Last Host: Usable IP addresses for devices
- Total Hosts: All possible addresses in subnet
- Usable Hosts: Addresses available for devices
Common CIDR Notations
- /24: 255.255.255.0 (254 hosts)
- /25: 255.255.255.128 (126 hosts)
- /26: 255.255.255.192 (62 hosts)
- /27: 255.255.255.224 (30 hosts)
- /28: 255.255.255.240 (14 hosts)