🌐 Subnet Calculator
Calculate IPv4 subnet information including network address, broadcast address, subnet mask, and host ranges. This subnet calculator supports CIDR notation and provides detailed binary representations for network planning and troubleshooting.
Subnet Information
📋 Network Details
IP Class: A
🔢 Binary Representation
📊 Subnet Summary
📚 CIDR Quick Reference
| CIDR |
Subnet Mask |
Hosts |
| /24 |
255.255.255.0 |
254 |
| /25 |
255.255.255.128 |
126 |
| /26 |
255.255.255.192 |
62 |
| /27 |
255.255.255.224 |
30 |
| /28 |
255.255.255.240 |
14 |
| /29 |
255.255.255.248 |
6 |
| /30 |
255.255.255.252 |
2 |
🌐 Understanding IP Subnetting
Subnetting is the practice of dividing a network into smaller sub-networks (subnets). This allows for better network organization, improved security, and more efficient use of IP address space.
🔢 IP Address Classes
| Class |
Range |
Default Mask |
Private Ranges |
| 🅰️ Class A |
1.0.0.0 - 126.255.255.255 |
255.0.0.0 (/8) |
10.0.0.0/8 |
| 🅱️ Class B |
128.0.0.0 - 191.255.255.255 |
255.255.0.0 (/16) |
172.16.0.0/12 |
| 🅲 Class C |
192.0.0.0 - 223.255.255.255 |
255.255.255.0 (/24) |
192.168.0.0/16 |
🎭 Subnet Mask Functions
- 🔍 Network Identification: Determines network and host portions
- 🚧 Broadcast Domain: Defines broadcast boundaries
- 🛣️ Routing: Helps routers make forwarding decisions
- 🔒 Security: Creates logical network segments
📊 CIDR Notation Benefits
| Benefit |
Description |
Example |
| 🎯 Precision |
Exact subnet size specification |
/25 = 128 addresses |
| 📝 Simplicity |
Shorter notation than full mask |
/24 vs 255.255.255.0 |
| 🔄 Flexibility |
Easy subnet size adjustments |
/26 to /25 doubles hosts |
| 📈 Scalability |
Supports VLSM efficiently |
Different subnet sizes |
🛠️ Subnetting Best Practices
- 📋 Plan Ahead: Consider future growth requirements
- 🎯 Right-Size: Don't waste IP addresses with oversized subnets
- 📊 Document: Maintain accurate subnet documentation
- 🔒 Security: Use subnets to create security zones
- 🚀 Performance: Smaller broadcast domains improve performance
- 🔄 VLSM: Use Variable Length Subnet Masking for efficiency
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