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IPv4 Subnet & CIDR Mask Calculator
Calculate network address, broadcast address, subnet mask, wildcard, and usable host IP ranges for any CIDR prefix.
Parameters
Configure the inputs for precise results.
Awaiting Parameters
Fill in the tool settings and click calculate to see the magic happen.
How to Use
1
Enter IPv4 Address
Input your host or network IP address.
2
Select CIDR Prefix
Choose subnet prefix between /1 and /32.
3
Calculate Subnet Bounds
View network IP, broadcast, mask, and usable host address ranges.
FAQ
What is a CIDR subnet mask?
CIDR (Classless Inter-Domain Routing) represents the number of leading 1-bits in the subnet mask (e.g. /24 = 255.255.255.0 = 256 addresses).
Why are 2 IP addresses reserved in a subnet?
In standard IPv4 subnets, the first address is reserved for the Network ID and the last address is reserved for the Broadcast address.