IPv4 Network Calculator (Range Finder)
Enter an IP and CIDR prefix (or subnet mask) to calculate network range, broadcast, usable hosts, and more.
What does a network calculator range do?
A network calculator range tool turns an IP address and subnet size into practical answers you can use immediately. Instead of manually converting binary bits, you instantly see:
- The network address (where the subnet starts)
- The broadcast address (where the subnet ends)
- The usable host range (assignable addresses)
- The subnet mask and wildcard mask
- Total address count and usable host capacity
In short, it reduces mistakes and saves time when designing LANs, VLANs, cloud networks, and routing plans.
How the range is calculated
1) Start with IPv4 + prefix
An IPv4 address has 32 bits. A prefix like /24 means the first 24 bits are the network portion and the remaining 8 bits are host bits.
2) Build the subnet mask
The prefix is converted into a mask. For example:
/24 = 255.255.255.0/26 = 255.255.255.192/30 = 255.255.255.252
3) Find boundaries
- Network address = IP address AND subnet mask
- Broadcast address = network + all host bits set to 1
- Usable range = network+1 through broadcast-1 (except /31 and /32 special cases)
CIDR quick reference
| Prefix | Subnet Mask | Total Addresses | Usable Hosts |
|---|---|---|---|
| /24 | 255.255.255.0 | 256 | 254 |
| /25 | 255.255.255.128 | 128 | 126 |
| /26 | 255.255.255.192 | 64 | 62 |
| /27 | 255.255.255.224 | 32 | 30 |
| /28 | 255.255.255.240 | 16 | 14 |
| /29 | 255.255.255.248 | 8 | 6 |
| /30 | 255.255.255.252 | 4 | 2 |
| /31 | 255.255.255.254 | 2 | 2 (point-to-point) |
| /32 | 255.255.255.255 | 1 | 1 (single host route) |
When this tool is useful
Subnetting office networks
If your company has multiple departments, this calculator helps divide a large block into smaller VLAN subnets with the right host capacity for each team.
Cloud and virtual infrastructure
In AWS, Azure, or GCP, assigning overlapping CIDR blocks can break routing. Calculating ranges upfront prevents hard-to-debug connectivity issues.
Firewall and ACL planning
Security rules often depend on network boundaries. Knowing exact start/end ranges lets you write clean, minimal access policies.
Common mistakes to avoid
- Mixing up /24 and 255.255.255.0 with other masks
- Assigning the network address or broadcast address to devices on normal subnets
- Choosing a subnet too small for future growth
- Overlapping private ranges between branch offices or VPN peers
FAQ
What is the difference between total and usable hosts?
Total addresses include all IPs in the block. Usable hosts usually exclude network and broadcast addresses. For /31 and /32, behavior is special and intentionally handled by modern networking standards.
Can I use subnet mask instead of CIDR?
Yes. This calculator accepts either. If you type a valid mask (like 255.255.254.0), it derives the prefix automatically.
Does this calculator support IPv6?
This page is designed for IPv4 range calculations. IPv6 uses different conventions and much larger address space, requiring a dedicated calculator.
Bottom line
A reliable network calculator range tool is one of the fastest ways to improve accuracy in network design. Use it during planning, implementation, and troubleshooting to ensure your addressing scheme is consistent, scalable, and easy to maintain.