Free IP Range Calculator Online
Calculate IP address range from network address and subnet mask
The IP Range Calculator takes a network address and subnet mask (or CIDR prefix) and returns the complete range of IP addresses in that subnet — the first host, last host, broadcast address, and total address count. Network administrators use it to verify firewall rules, document DHCP pool boundaries, and check whether a specific IP falls within a given subnet.
Frequently Asked Questions
About the IP Range Calculator
Every IP subnet has a defined range of addresses, bounded by its network address at the bottom and broadcast address at the top. The hosts within that range — everything in between — are the only addresses that devices can actually use. Knowing the precise boundaries matters when writing access control lists, configuring DHCP, or verifying that two subnets don't overlap.
This calculator works from both directions: enter the network address and mask in dotted-decimal, or use CIDR notation, and it resolves the full range in either case. It also accepts an arbitrary IP and mask and identifies which network that IP belongs to.
Use it alongside the Subnet Calculator when designing address plans, or to quickly answer questions like "does 10.0.5.200 fall in the 10.0.5.192/27 subnet?" without needing to do binary arithmetic in your head.
When Should You Use This?
The IP Range Calculator is ideally suited for developers, network engineers, and IT professionals who need to perform quick, accurate calculations related to general calculations. Use this tool when you need to verify figures, compare different scenarios, or get a precise answer without manual computation errors.
What Does The Result Mean?
The calculated output provides an instant, accurate resolution to your input parameters. You can use these results directly for your planning, assignments, or professional tasks, knowing they are based on standardized formulas.
Example Calculation
Finding the host range for a /28 subnet
📥 Inputs
- Network address: 192.168.10.48
- Subnet mask: 255.255.255.240 (/28)
🔢 Calculation Steps
- 1/28 means 4 bits for hosts: 2^4 = 16 total addresses
- 2Network address: 192.168.10.48 (given)
- 3Broadcast: 192.168.10.48 + 16 − 1 = 192.168.10.63
- 4First usable host: 192.168.10.49
- 5Last usable host: 192.168.10.62
- 6Usable host count: 16 − 2 = 14
Limitations of this Calculator
- Results are based purely on the mathematical relationship of the inputs provided.
- Does not account for edge cases or extreme outlier values that fall outside standard formula constraints.
- Calculated outputs should be double-checked against your specific real-world requirements before finalizing important decisions.
How to Use the IP Range Calculator
- 1Enter your values into the IP Range Calculator input fields above.
- 2Review the input labels to ensure you are using the correct units.
- 3Click the "Calculate" button to get your instant result.
- 4Use the step-by-step breakdown to understand how the result was calculated.
- 5Export or copy your result to use in reports or share with others.
Tips & Best Practices
- Double-check your input units before calculating — using the wrong unit is the most common source of errors.
- Bookmark this IP Range Calculator for quick access next time you need it.
- Use the share button to send your results to a colleague or save them for later reference.
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