No recently used tools
No favorite tools yet

Subnet Calculator: Calculate IP Subnets & CIDR | Free Tool

2 uses

Subnet Calculator Tips

Complete Subnet Info
Calculate network address, subnet mask, wildcard, broadcast, first/last usable IP, and host count.
All CIDR Prefixes
Choose any CIDR prefix from /1 to /32 with host count shown for each.
IP Class Detection
Automatically detects IP class (A/B/C/D/E) and whether the address is public or private.
Binary View
See the IP address in binary notation for educational purposes.

Frequently Asked Questions

Q What is a subnet?
A A subnet divides a network into smaller segments. The CIDR prefix (e.g., /24) determines how many hosts each subnet can have.
Q What is CIDR notation?
A CIDR (Classless Inter-Domain Routing) uses /prefix to indicate the number of network bits. /24 = 256 IPs (254 usable).
Q What is a subnet mask?
A A subnet mask separates the network portion from the host portion of an IP address. /24 = 255.255.255.0.
Q Is this free?
A Yes.
Q How do I determine the usable host IP range for a network using your subnet calculator?
A Our IP Subnet Calculator simplifies finding the usable host IP range. Simply enter your network's IP address and the CIDR prefix (e.g., 192.168.1.0/24) into the tool. It will instantly display the 'Usable IP Range,' showing the first and last IP addresses available for assigning to devices. This excludes the network address and the broadcast address, crucial for efficient network planning and avoiding configuration errors.
Q How do I calculate the maximum number of usable IP addresses for a given CIDR prefix?
A Our IP Subnet Calculator makes this simple. Enter your network's IP address and the CIDR prefix (e.g., 192.168.1.0/27). The tool instantly displays the 'Host Count,' which represents the total number of IP addresses in that subnet. To find the *usable* IP addresses, subtract two (for the network and broadcast addresses) from this total, giving you the assignable range for your devices.

How to Calculate Subnets

Related Tools

XML Formatter & Validator

HTML Formatter & Beautifier

CSS Formatter & Beautifier

JavaScript Formatter & Beautifier

SQL Formatter & Beautifier

JSON to CSV Converter

Everyday Tools
Ideal Weight CalculatorSleep Cycle CalculatorWater Intake CalculatorElectronic Signature MakervCard Generator
Calculators
Compound Interest CalculatorSalary CalculatorROI CalculatorScientific CalculatorMortgage CalculatorBMI CalculatorNumber Base ConverterInterest CalculatorAuto Loan CalculatorSavings CalculatorAPY CalculatorOvulation CalculatorPercentage CalculatorDue Date CalculatorFraction CalculatorSafe Period CalculatorRatio CalculatorPeriod CalculatorLoan CalculatorCalorie CalculatorDiscount CalculatorBody Fat CalculatorTip CalculatorFuel Consumption CalculatorLoan Prepayment Calculator
Learning Tools
Periodic TableMultiplication TablePrime Number CheckerMatrix CalculatorEquation Solver
Text Tools
Character CounterRemove Duplicate LinesCase ConverterText Diff CheckerJSON FormatterBase64 Encoder/DecoderMD5 Hash GeneratorURL Encode DecodeHTML EscapeText Encrypt DecryptMorse Code TranslatorRegex TesterUnicode ConverterSpecial CharactersASCII Converter & TableRoman Numeral ConverterWhitespace CleanerText ReverserText SorterLorem Ipsum GeneratorText Similarity Checker
Date & Time Tools
Age CalculatorDate CalculatorUnix Timestamp ConverterWorld ClockCountdown TimerWeek NumberDay of Week CalculatorBusiness Day CalculatorTimezone ConverterOnline Stopwatch
Unit Converters
Length ConverterWeight ConverterTemperature ConverterArea ConverterVolume ConverterData Storage ConverterSpeed ConverterTime ConverterPower ConverterPressure ConverterAngle ConverterCurrency ConverterClothing Size ChartShoe Size ChartFile Size Converter
Image Tools
Image CompressorImage CropperImage Format ConverterQR Code GeneratorImage WatermarkImage RotatorImage FilterImage CollageGIF MakerColor PickerImage ResizerImage PixelateImage BorderRounded CornersNine Grid SplitImage SlicerImage Base64 ConverterMeme MakerPixelate ImagePhoto to SketchBase64 to Image ConverterBarcode GeneratorPlaceholder Image GeneratorLogo MakerFavicon GeneratorApp Icon GeneratorID Photo MakerPhoto Collage MakervCard QR Code Generator
Random Generators
Password GeneratorRandom Number GeneratorRandom PickerRandom Name PickerDice RollerCoin FlipUUID GeneratorRandom Color GeneratorRandom Name GeneratorPhone Number GeneratorTest Credit Card GeneratorYes or No Decision Maker
Developer Tools
Cron Expression GeneratorJSON EditorRegex VisualizerXML Formatter & ValidatorHTML Formatter & BeautifierCSS Formatter & BeautifierJavaScript Formatter & BeautifierSQL Formatter & BeautifierJSON to CSV ConverterCSV to JSON ConverterXML to JSON ConverterYAML to JSON ConverterMarkdown to HTML ConverterSHA Hash GeneratorJWT Decoder & InspectorFile Hash CalculatorIP Subnet CalculatorHTTP Status Code ReferenceCSS Box Shadow GeneratorCSS Flexbox GeneratorCSS Grid GeneratorCSS Text Shadow GeneratorCSS Border Radius GeneratorCSS Animation Generator
Color Tools
HEX to RGB ConverterHSL Color ConverterCMYK to RGB ConverterColor Palette GeneratorColor Contrast CheckerColor Blender & Gradient MixerCSS Gradient Generator
SEO Tools
Meta Tag GeneratorOpen Graph GeneratorURL Slug GeneratorKeyword Density CheckerSchema Markup ValidatorSEO Title Analyzer
Social Media Tools
Social Cover MakerInstagram Font GeneratorTwitter Character CounterHashtag GeneratorSocial Media Image Size GuideTikTok Cover Maker
Link & URL Tools
UTM BuilderURL ParserQuery String Parser
Email Tools
Email Format CheckerEmail Signature GeneratorHTML Email Encoder
Data & Privacy
Password Strength CheckerData Masking ToolCSV CleanerAES Encryption & DecryptionRSA Encryption & Key Generator
Miscellaneous Tools
PPT CreatorImages to PPTOnline NotepadPomodoro TimerEmoji Finder & SearchASCII Art GeneratorTo-Do ListWord Cloud GeneratorQR Code ScannerOnline WhiteboardMeme Generator
Video Tools
Video CropOnline Screen RecorderVideo CompressorVideo Frame CaptureVideo to MP3Video TrimmerVideo to MP4Video RotatorVideo to GIF ConverterVideo Speed ChangerVideo WatermarkVideo MergerVideo MuteVideo Subtitle Burner
Audio Tools
Text to Speech (TTS)Online Audio RecorderOnline MetronomeAudio VisualizerTone & Frequency GeneratorWhite Noise GeneratorBPM Tap CounterAudio TrimmerAudio ConverterAudio MergerAudio Speed ChangerAudio Volume ChangerAudio Fade
PDF Tools
Protect PDFUnlock PDFAdd Page Numbers to PDFHTML to PDFMerge PDFImages to PDFCompress PDFPDF to ImagesPDF SplitPDF RotatePDF Reorder PagesPDF Watermark
Typing Tools
Typing Speed TestKeyboard TesterTyping Practice
Business Documents
Barcode Label MakerResume BuilderInvoice GeneratorReceipt GeneratorBusiness Letter GeneratorPrice Tag Generator