Subnet Calculator
Calculate network addresses, subnet masks, and host ranges for IP networks
Understanding Subnetting
Subnetting allows you to divide a large network into smaller, more manageable subnetworks. This calculator helps you determine network addresses, host ranges, and subnet masks based on CIDR notation.
Key Concepts
- Network Address:The first address in a subnet block
- Broadcast Address:The last address in a subnet block
- CIDR Notation:Represents network size (e.g., /24)
- Subnet Mask:Defines network and host portions
Common Subnet Masks
/24255.255.255.0256 addresses
/25255.255.255.128128 addresses
/26255.255.255.19264 addresses
/27255.255.255.22432 addresses
/28255.255.255.24016 addresses
/29255.255.255.2488 addresses
Subnetting Best Practices
Planning
- • Determine future growth needs
- • Account for network devices
- • Plan for scalability
- • Document all subnets
Implementation
- • Use efficient subnet sizes
- • Implement security zones
- • Configure proper routing
- • Test connectivity
Management
- • Monitor network usage
- • Update documentation
- • Review security policies
- • Plan for IPv6 transition