IP Subnet Calculator
Calculate network address, broadcast, usable hosts, and wildcard mask from IP and CIDR notation.
Usable Hosts
254
/24 network
Subnet Details
| Network Address | 192.168.1.0 |
| Broadcast Address | 192.168.1.255 |
| Subnet Mask | 255.255.255.0 |
| Wildcard Mask | 0.0.0.255 |
| First Usable Host | 192.168.1.1 |
| Last Usable Host | 192.168.1.254 |
| Usable Hosts | 254 |
| CIDR Notation | 192.168.1.0/24 |
Binary Subnet Mask
| Mask | 11111111.11111111.11111111.00000000 |
Common Subnets Reference
| /8 | 255.0.0.0 (16,777,214 hosts) |
| /16 | 255.255.0.0 (65,534 hosts) |
| /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) |
| /30 | 255.255.255.252 (2 hosts) |
Subnet calculations are based on IPv4 addressing. Usable host count excludes the network address and broadcast address for subnets larger than /30.
Use the IP Subnet Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.
Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.
How It Works
An IP Subnet Calculator helps network administrators divide IP address ranges into smaller, manageable subnets for efficient network organization. With IPv4 addresses becoming increasingly scarce and the projected 29.3 billion connected devices by 2026, proper subnet planning is crucial for optimal network performance and security.
The calculator uses CIDR (Classless Inter-Domain Routing) notation and subnet masks to determine network boundaries, host ranges, and broadcast addresses. It applies bitwise operations where the subnet mask defines which bits represent the network portion versus the host portion of an IP address.
Remember that the first IP in each subnet is the network address and the last is the broadcast address, both unusable for hosts. A common mistake is forgetting to account for these reserved addresses when calculating available host IPs, which reduces your usable addresses by 2 per subnet.
Subnetting a Class C Network for a Small Office with 50 Devices
- 1 Start with the network 192.168.1.0/24 and determine you need subnets for different departments, requiring at least 14 host addresses per subnet.
- 2 Calculate the required subnet mask: since you need 14 hosts, you need 4 host bits (2^4 = 16 addresses, minus 2 reserved = 14 usable), leaving 28 network bits (/28).
- 3 The subnet mask becomes 255.255.255.240, creating 16 possible subnets (2^4) with 14 usable host addresses each.
- 4 First subnet: 192.168.1.0/28 with usable host range 192.168.1.1 to 192.168.1.14, providing adequate addressing for your 50-device office across multiple subnets.
Source: IETF · Last updated: April 2026
Frequently Asked Questions
What is a subnet mask and what does it do?
How many usable hosts does a /24 subnet have?
What is CIDR notation?
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