How do I calculate an IP address range?

Apply the subnet mask or CIDR prefix to find the network ID, then set all host bits to one for the last address. This calculator does that from an IP plus CIDR, or counts addresses between a first and last IP you type yourself.

How do I find the first and last IP in a subnet?

The first IP is the network address. The last IP is the broadcast address. Usable hosts sit strictly between those two values on a normal LAN subnet.

How many addresses are in an IP range?

From CIDR, total addresses equal 2^(32 − prefix). Between two IPs, count every address inclusive of both ends. The tool shows both figures so you can check subnetting practice quickly.

Can I calculate a range from CIDR?

Yes. Enter any IPv4 address with a CIDR prefix or dotted mask and the calculator returns the full range, usable hosts, and totals.

Can I find usable IPs in a network range?

Yes. In CIDR mode the results list first and last usable IP plus the usable host count after removing network and broadcast addresses.

What is IP Range Calculator?

It is a free online tool that maps CIDR or start-end IPv4 values into a clear address range for students, engineers, and admins.

How does the IP Range Calculator work?

CIDR mode builds the network and broadcast from the mask. Bounds mode subtracts the integer forms of the two addresses and adds one for an inclusive count.

How do I use the IP Range Calculator?

Pick a mode, enter your values, and read the results as you type. No install and no account are required.

Is this IP Range Calculator free to use?

Yes. It is free for beginners, CCNA students, IT students, and network administration checks.

Can I use the IP Range Calculator on mobile?

Yes. The page works in mobile browsers, so you can verify ranges away from your desk.

Free IP Range Calculator Online, CIDR to IPv4 Range

Free IP Range Calculator Online, CIDR to IPv4 Range | Binary Tech