IP Subnet Calculator
Calculate network addresses, broadcast addresses, subnet masks, and more with our advanced subnetting tool
IP Address Information
Enter a valid IPv4 address (0.0.0.0 to 255.255.255.255)
/24
(255.255.255.0)
Advanced Options
Subnet Calculation Results
Network Address
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Broadcast Address
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Subnet Mask
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CIDR Notation
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First Usable IP
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Last Usable IP
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Total Hosts
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Usable Hosts
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Binary Representation
IP Address:
00000000.00000000.00000000.00000000
Subnet Mask:
00000000.00000000.00000000.00000000
Network Address:
00000000.00000000.00000000.00000000
Subnet Allocation
| Subnet | Network Address | First Host | Last Host | Broadcast | Hosts |
|---|---|---|---|---|---|
| Enter IP and subnet mask to calculate subnet allocation | |||||
📋 Subnetting Cheat Sheet
| CIDR | Subnet Mask | # of Subnets | # of Hosts | Class A Hosts | Class B Hosts | Class C Hosts |
|---|---|---|---|---|---|---|
| /24 | 255.255.255.0 | 1 | 254 | 16,777,214 | 65,534 | 254 |
| /25 | 255.255.255.128 | 2 | 126 | 8,388,606 | 32,766 | 126 |
| /26 | 255.255.255.192 | 4 | 62 | 4,194,302 | 16,382 | 62 |
| /27 | 255.255.255.224 | 8 | 30 | 2,097,150 | 8,190 | 30 |
| /28 | 255.255.255.240 | 16 | 14 | 1,048,574 | 4,094 | 14 |
| /29 | 255.255.255.248 | 32 | 6 | 524,286 | 2,046 | 6 |
| /30 | 255.255.255.252 | 64 | 2 | 262,142 | 1,022 | 2 |
Note: This table shows common subnet masks and their characteristics. Host counts exclude network and broadcast addresses.
📚 IP Subnetting Tips
Understand Binary
Subnetting is based on binary math. Understanding how to convert between decimal and binary is crucial.
Start with Requirements
Determine how many subnets and hosts per subnet you need before choosing your subnet mask.
Use the Magic Number
256 - subnet mask value = block size (e.g., 256-192=64). This helps determine subnet boundaries.
Plan for Growth
Always allocate more addresses than currently needed to accommodate future network expansion.
Practice Regularly
Subnetting is a skill that improves with practice. Work through examples regularly.
Memorize Key Values
Know common subnet masks (/24, /25, /26, etc.) and their host counts to speed up calculations.
Dark Mode
Note: This calculator provides subnet information based on standard IPv4 subnetting rules. For complex network designs or IPv6 calculations, consult with a network professional.