CIDR Calculator

Calculate IPv4 network information from a CIDR notation.

IPv4 Address / CIDR

Enter an IPv4 address followed by a CIDR prefix, such as 192.168.1.0/24.

Network Information

Network Address

—

Broadcast Address

—

Subnet Mask

—

Wildcard Mask

—

CIDR Prefix —

Total Addresses —

Usable Hosts —

First Usable IP —

Last Usable IP —

IP Version —

Traditional Class —

Host Bits —

Binary Representation

IP Address in Binary —

Subnet Mask in Binary —

Network Range —

What is CIDR?

CIDR stands for Classless Inter-Domain Routing. It is a method used to represent IP networks using an IP address followed by a prefix length.

For example, 192.168.1.0/24 means that the first 24 bits identify the network, while the remaining 8 bits are available for host addresses.

CIDR is widely used in network design, cloud environments, Kubernetes, VPNs, routing, firewalls and infrastructure planning.

How to Use This Calculator

Enter an IPv4 network in CIDR notation and click Calculate.

• 192.168.1.0/24
• 10.0.0.0/8
• 172.16.0.0/16
• 192.168.10.0/26
• 10.20.30.40/32

Understanding the Results

Network Address identifies the beginning of the network.

Broadcast Address identifies the last address in an IPv4 subnet and is traditionally used to communicate with all hosts in that subnet.

Subnet Mask represents the network portion of the IPv4 address in dotted-decimal notation.

Wildcard Mask is the inverse of the subnet mask and is commonly used in routing and access-control configurations.

Usable Hosts represents the number of addresses traditionally available for hosts. For standard IPv4 networks, the network and broadcast addresses are normally excluded.

For /31 and /32 networks, the calculator applies the commonly used point-to-point and host-specific conventions.

Privacy

This calculator runs entirely in your browser. The IP addresses you enter are not sent to an IceNex server.

No account, registration or personal information is required.

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