IP Range Calculator
Total addresses and range between two IPv4 addresses.
Enter your values
Enter the start ip you are working with.
Enter the end ip you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Total addresses
- 254
- Range
- 10.0.0.1 - 10.0.0.254
- Nearest CIDR block size
- 2^8 = 256
Quick answer
Address count = end IP numeric value - start IP numeric value + 1.
count = endNum - startNum + 1
At a glance
| What it does | Total addresses and range between two IPv4 addresses. |
|---|---|
| Category | Technology |
| Inputs needed | Start IP, End IP |
| Main output | Total addresses |
| Formula | count = endNum - startNum + 1 |
| Cost | Free — no sign-up, no download |
How to use the IP Range Calculator
- 1Enter the start and end IPv4 addresses of the range.
- 2The calculator converts both to numeric form and finds the difference.
- 3Read the total number of addresses spanned.
Inputs explained
- Start IP
- Enter the start ip you are working with.
- End IP
- Enter the end ip you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Start IP10.0.0.1
- End IP10.0.0.254
Results
- Total addresses254
- Range10.0.0.1 - 10.0.0.254
- Nearest CIDR block size2^8 = 256
Frequently asked questions
Is this the same as usable hosts?
This counts every address in the range; subtract 2 if network/broadcast addresses should be excluded.
What if the range doesn't fit a clean CIDR block?
The nearest power-of-two block size is shown, but you may need multiple CIDR blocks to cover an odd range exactly.
What do I need to enter into the IP Range Calculator?
Just 2 values: start ip, end ip. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the IP Range Calculator work out the answer?
Address count = end IP numeric value - start IP numeric value + 1. It applies the formula count = endNum - startNum + 1 and shows the working so you can check each step by hand.
Is the IP Range Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.