Calculate the network address, broadcast address, usable host range, subnet mask, and total addresses for any IPv4 network from an IP and CIDR prefix.
How it works
- Input the base IPv4 address into the tool.
- Enter the CIDR prefix (e.g., 24).
- Instantly view the calculated subnet mask, broadcast IP, and usable host range.
Frequently asked questions
What does a /24 actually mean?
The /24 is CIDR notation indicating the first 24 bits are dedicated to the network, leaving 8 bits for hosts. This translates to the classic 255.255.255.0 subnet mask.
Why are two addresses always unusable in a range?
The absolute first IP defines the network identifier, and the final IP is reserved for mass broadcasting. Neither can be assigned to a specific computer.
What is a wildcard mask?
It is the exact mathematical inverse of the subnet mask, heavily utilized in Cisco Access Control Lists (ACLs).