NW Checker

Validate IP addresses and subnet masks, calculate network information including network address, broadcast address, and usable host range.

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About This Tool

The Network Checker is a comprehensive online tool that helps network administrators, IT professionals, and students validate IP addresses and subnet masks. Simply enter an IP address with either a subnet mask or CIDR notation, and the tool will calculate the network address, broadcast address, total hosts, usable hosts, and host range. It validates both IPv4 addresses and subnet masks to ensure they follow proper networking standards. The tool provides clear, detailed results in an easy-to-read format.

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How to Use

Enter an IPv4 address in the first field (e.g.,
Enter either a subnet mask (e.g.,
or CIDR notation (e.g., /
Click the 'Calculate Network Information' button
View the results including network address, broadcast address, total hosts, usable hosts, and host range
For validation only, you can enter just an IP address or subnet mask and click 'Validate'

Frequently Asked Questions

Find Quick Answers

What IP address formats does this tool support?

The tool supports standard IPv4 addresses in dotted-decimal notation (e.g., 192.168.1.1). It does not currently support IPv6 addresses.

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation represents a subnet mask as a slash followed by a number (e.g., /24). The number indicates how many bits are set to 1 in the subnet mask.

How does the tool calculate usable hosts?

Usable hosts are calculated by subtracting 2 from the total hosts: one address is reserved for the network address and one for the broadcast address.

Can I validate just an IP address without a subnet mask?

Yes, you can enter just an IP address and click the 'Validate IP Address' button to check if it's a valid IPv4 address.

What happens if I enter an invalid IP or subnet?

The tool will highlight the invalid field in red and display a specific error message explaining what's wrong (e.g., 'IP address octets must be between 0 and 255').

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