UtilHero

Subnet / CIDR Calculator

IPv4 network, broadcast, host range, and host count.

CIDR notation
192.168.1.0/24
Netmask
255.255.255.0
Wildcard mask
0.0.0.255
Network address
192.168.1.0
Broadcast address
192.168.1.255
Usable host range
192.168.1.1 – 192.168.1.254
Usable hosts
254
Total addresses
256

About NetToolkit

NetToolkit is a suite of network calculators for engineers: subnet and CIDR calculation, IPv4 address conversion (decimal, hex, binary), signal power (dBm↔mW), and data transfer time. Enter your values and get instant, accurate results in your browser.

Frequently asked questions

What does the subnet calculator show?
For an IP and prefix it returns the network and broadcast addresses, netmask, wildcard, usable host range, and host count.
Can it convert an IP to binary or hex?
Yes. It shows an IPv4 address in decimal, hexadecimal, and dotted-binary form.
What is dBm to mW used for?
Converting between decibel-milliwatts and milliwatts is common in RF and wireless link-budget calculations.

More tools

Unit ConverterClick CounterClick TestPassword GeneratorID GeneratorStopwatchTimerTodo ListWord CounterJSON FormatterJSON VisualizerQR Code GeneratorPercentage CalculatorAge CalculatorBase64 Encode / DecodeCase ConverterHash GeneratorURL Encode / DecodeUnix Timestamp ConverterColor ConverterLorem Ipsum GeneratorBMI CalculatorTip CalculatorJWT DecoderJWT EncoderRegex TesterSlugifyText DiffRemove Duplicate LinesDiscount CalculatorLoan CalculatorTime Duration CalculatorContrast CheckerGradient GeneratorPalette GeneratorTints & ShadesImage to Base64Image ResizerFavicon GeneratorMerge & Split PDF