Calculator Inputs
Formula Used
Network Address
Network = IP Address AND Subnet Mask
Broadcast Address
Broadcast = Network OR Wildcard Mask
Wildcard Mask
Wildcard = 255.255.255.255 - Subnet Mask
Address Counts
Total Addresses = 2^(32 - CIDR Prefix)
For standard subnets from /0 to /30, usable hosts equal:
Usable Hosts = Total Addresses - 2
For /31 networks, both addresses are usable in point-to-point links. For /32, the single address represents one host only.
How to Use This Calculator
- Enter any valid IPv4 address in dotted decimal form.
- Type the CIDR prefix length from 0 through 32.
- Choose a preview limit, preview mode, and sorting order.
- Click Generate IP Range to view the result above the form.
- Review the summary metrics, address preview table, and graphs.
- Use the CSV button for spreadsheet export or PDF for printable documentation.
Example Data Table
| Input IP | CIDR | Network Address | Broadcast Address | First Usable | Last Usable | Usable Hosts |
|---|---|---|---|---|---|---|
| 192.168.10.15 | /24 | 192.168.10.0 | 192.168.10.255 | 192.168.10.1 | 192.168.10.254 | 254 |
| 10.0.5.33 | /27 | 10.0.5.32 | 10.0.5.63 | 10.0.5.33 | 10.0.5.62 | 30 |
| 172.16.8.129 | /25 | 172.16.8.128 | 172.16.8.255 | 172.16.8.129 | 172.16.8.254 | 126 |
Frequently Asked Questions
1. What does this IP range generator calculate?
It calculates the network address, broadcast address, subnet mask, wildcard mask, first usable host, last usable host, total addresses, and usable host count for any IPv4 address and CIDR prefix.
2. Does the calculator support /31 and /32 networks?
Yes. A /31 is handled as a point-to-point range where both addresses are usable. A /32 is treated as a single-host network with one address only.
3. Why can the preview table show only part of a range?
Large networks can contain thousands or millions of addresses. The preview limit keeps the page fast and readable while still showing the beginning or ending section of the calculated block.
4. What is the difference between subnet mask and wildcard mask?
The subnet mask marks network bits with ones. The wildcard mask is its inverse and marks host bits with ones. Wildcards are often used in routing and access control lists.
5. Does the tool generate only private address ranges?
No. It works with private, public, loopback, link-local, multicast, and reserved IPv4 addresses. The result also labels the detected scope to help identify the address type.
6. Can I export the results for documentation?
Yes. The CSV export saves the summary and preview rows. The PDF export captures the visible result section, making it suitable for planning notes, audits, and implementation records.
7. What does host offset mean?
Host offset is the numeric distance between the submitted IP and the network address. It helps you see where the chosen address sits inside the calculated subnet block.
8. Can I use this for subnet planning and migration work?
Yes. The tool is useful for subnet validation, allocation planning, host range verification, migration checklists, security reviews, and inventory preparation before deploying network changes.