CIDR Calculator

Network Configuration

Enter IP Address with CIDR notation:

Quick Examples:

Calculation Results

Network Address:

Broadcast Address:

Subnet Mask:

Wildcard Mask:

First Usable IP:

Last Usable IP:

Total Hosts:

Usable Hosts:

IP Class:

IP Type:

Additional Formats

Binary Netmask:

Hex Netmask:

Network Visualization

About CIDR Notation

CIDR (Classless Inter-Domain Routing) notation is a compact method for specifying IP addresses and their associated network masks. It uses the format IP/prefix, where the prefix length indicates the number of significant bits in the network mask.

For example, 192.168.1.0/24 represents a network with:

Network address: 192.168.1.0
Subnet mask: 255.255.255.0
256 total addresses (254 usable hosts)
Broadcast address: 192.168.1.255