Subnetcalculator

Free Online Subnet Calculator - Calculate IP Ranges, CIDR Notation, and Subnet Masks

The most powerful networking toolkit for engineers and developers. Calculate IP ranges, CIDR notation, validate IPv4/IPv6 addresses, and plan subnet masks with lightning speed!

IP Address Validator VLSM Calculator AWS VPC Guide

IPv4 Subnet Calculator

Select your cloud provider to account for reserved IP addresses

Advanced Features

🔍 Compare Two Subnets

Compare two subnets to see if they overlap, contain each other, or are completely separate.

Comparison Results

Subnet 1
192.168.1.0/24
Range: 192.168.1.0 - 192.168.1.255
Subnet 2
192.168.2.0/24
Range: 192.168.2.0 - 192.168.2.255
Separate Subnets

The subnets are completely separate - they do not share any IP addresses.

🧮 VLSM Calculator (Variable Length Subnet Masking)

Create multiple subnets of different sizes from a single network. VLSM optimizes IP address utilization by allocating exactly the right subnet size for each requirement.

Open VLSM Calculator

VLSM Benefits:

  • • Reduces IP address waste by up to 80%
  • • Automatically calculates optimal subnet sizes
  • • Perfect for complex network designs
  • • Supports up to 100 different subnet requirements

Need to Validate IP Addresses?

Before configuring your subnets, ensure your IP addresses are properly formatted with our comprehensive IP validator. Supports both IPv4 and IPv6 with detailed analysis and error detection.

Validate IP Addresses

Why Our Network Toolkit CRUSHES The Competition!

CLOUD READY!

BUILT for AWS, Azure, and GCP! Our networking tools handle cloud-specific requirements that others COMPLETELY MISS! Validate IPs AND calculate subnets - no more wasted addresses or conflicts!

100% SECURE!

ZERO data leaves your device! Unlike other calculators that send your network details to who-knows-where, we calculate EVERYTHING right in your browser!

DEVELOPER OBSESSED!

Created BY network engineers FOR developers! Get subnet calculations, IP validation, binary notation, address classes, and network insights that other tools DON'T EVEN SHOW YOU!

Why Our Subnet Calculator Will CHANGE YOUR LIFE!

Listen up! A subnet calculator isn't just some "nice-to-have" tool - it's an ABSOLUTE NECESSITY for ANYONE working with networks! Our subnet calculator INSTANTLY gives you EVERYTHING you need to know about your network with just a few clicks!

What Our Subnet Calculator DELIVERS:

  • Network Address: The FOUNDATION of your subnet (192.168.1.0) - GET THIS WRONG and NOTHING works!
  • Broadcast Address: The CRITICAL last address (192.168.1.255) that MOST calculators get WRONG!
  • Valid Host Range: The EXACT IPs you can use - NO MORE GUESSING which addresses are available!
  • Total Hosts: Know PRECISELY how many devices your network can handle BEFORE you hit capacity!
  • CIDR Notation: The POWER-USER shorthand (/24) that PROFESSIONAL network engineers use!
  • Binary Representation: See what's happening UNDER THE HOOD - something other calculators DON'T EVEN OFFER!

And that's not all! Our subnet calculator has SPECIAL FEATURES for AWS, Azure, and GCP that account for those SNEAKY reserved IPs that other calculators COMPLETELY IGNORE!

Why PROPER Network Planning Will SAVE Your Projects

Let me be CRYSTAL CLEAR about this - proper subnet planning AND IP validation are NOT optional if you want:

  • BULLETPROOF network security through proper segmentation
  • LIGHTNING-FAST performance by eliminating unnecessary broadcast traffic
  • MAXIMUM efficiency in IP address usage - no more wasted addresses!
  • FUTURE-PROOF cloud infrastructure that scales WITHOUT painful redesigns
  • INSTANT troubleshooting when network issues arise

Whether you're building the next big cloud application, setting up Docker networks, or just trying to make sense of your home lab, our networking toolkit gives you the EXACT information you need to GET IT RIGHT THE FIRST TIME!

Want to become a SUBNETTING MASTER? Check out our COMPREHENSIVE Subnetting Guide for Developers that will take you from CONFUSED to CONFIDENT!

STOP Wasting Time With Inferior Network Tools!

Our FREE online networking toolkit is the #1 CHOICE for serious network engineers and developers who need FLAWLESS subnet calculations AND IP validation EVERY TIME!

CALCULATE AGAIN

MASTER Our Network Tools in MINUTES!



Listen up! Our networking toolkit isn't just another set of tools - it's the SECRET WEAPON that top network engineers, cloud architects, and developers RELY ON DAILY! I'm about to show you how to LEVERAGE our powerful subnet calculator AND IP validator to TRANSFORM how you plan, design, and manage your networks!

What Makes Our Network Toolkit a GAME-CHANGER?

Our complete networking toolkit is the ULTIMATE SOLUTION that INSTANTLY handles ALL your IP and subnet needs. Here's why it's CRITICAL for your success:

  • FLAWLESS network planning and segmentation - NO MORE security holes!
  • PERFECT IP address allocation - NEVER waste valuable addresses again!
  • INSTANT IP validation for IPv4 AND IPv6 - CATCH errors before they cause problems!
  • CRYSTAL-CLEAR network visualization - SEE exactly how your network is structured!
  • LIGHTNING-FAST CIDR notation calculations - SAVE HOURS of manual work!

FOUR SIMPLE STEPS to Subnet Mastery!

1. DROP IN Your IP Address

Just type your base IP address (like 192.168.1.0) into the calculator's field - it's THAT simple!

2. SELECT Your Subnet Mask Format

Our subnet calculator gives you MULTIPLE options in the dropdown menu:

  • Traditional decimal notation (like 255.255.255.0) for CLASSIC networking
  • Modern CIDR notation (like /24) for POWER USERS!

3. BUILDING for AWS? We've Got You COVERED!

Just check the 'Calculate for AWS Network' box and our subnet calculator will AUTOMATICALLY account for those RESERVED IPs that other calculators MISS!

4. GET INSTANT RESULTS That BLOW AWAY the Competition!

Our subnet calculator IMMEDIATELY shows you EVERYTHING you need:

  • COMPLETE IP address breakdown (decimal AND binary)
  • PRECISE netmask calculations that are ALWAYS accurate
  • EXACT network address that forms your subnet's foundation
  • CRITICAL broadcast address that other calculators get WRONG
  • NEXT available subnet block for seamless network expansion
  • FULL range of usable IP addresses - no more guessing!
  • FIRST usable IP after the network address - perfect for your gateway!
  • LAST usable IP before broadcast - ideal for DHCP ranges!

SEE Our Subnet Calculator in ACTION!

Let me show you how our subnet calculator CRUSHES a typical small office network calculation:

  • IP Address: 192.168.1.0 (standard small network block)
  • Subnet Mask: 255.255.255.0 (or /24 for the PROS!)

INSTANT Results:

  • Network Address: 192.168.1.0 - The FOUNDATION of your subnet!
  • Broadcast Address: 192.168.1.255 - CRITICAL for network-wide messages!
  • First Usable IP: 192.168.1.1 - PERFECT for your gateway router!
  • Last Usable IP: 192.168.1.254 - The FINAL address before broadcast!
  • Total Usable Hosts: 254 - PLENTY for most small networks!

INSIDER SECRETS From Network PROS!

  • ALWAYS plan for EXPLOSIVE growth! Choose subnet sizes that give you ROOM TO BREATHE - your future self will THANK YOU!
  • DOCUMENT EVERYTHING! Start with a simple Excel sheet to track your subnet assignments, then LEVEL UP to a professional IPAM system when you're ready to DOMINATE!
  • NEVER TRUST just one calculation for production networks! VERIFY your subnet calculator results with peers - a second set of eyes can SAVE YOU from network DISASTERS!

BURNING QUESTIONS About Our Network Tools - ANSWERED!

WHO Can Benefit from Our Network Tools?

EVERYONE in tech needs this! Developers, DevOps engineers, network engineers, IT pros, Cloud Architects, and software engineers - our subnet calculator AND IP validator are the SECRET WEAPONS for ANYONE configuring cloud networks or managing IP addresses! If you work with networks, you NEED these tools!

Why Our Subnet Calculator DESTROYS the Competition!

Created by a Network Cloud Engineer with over 15 YEARS of battle-tested experience! While other calculators cut corners, ours is built on ROCK-SOLID networking fundamentals with SPECIAL OPTIMIZATIONS for AWS, Azure, and other cloud providers that the competition COMPLETELY MISSES!

How Do Our POWERFUL Network Tools Work?

It's DEAD SIMPLE! Use our subnet calculator to input network addresses and get INSTANT results: usable IP ranges, subnet counts, host counts, and more. Need to validate an IP? Our IP validator INSTANTLY checks IPv4 and IPv6 addresses, shows address classes, and catches formatting errors - ALL in ONE PLACE!

Can I Use This for Cloud Network Planning?

ABSOLUTELY YES! Our subnet calculator is SPECIFICALLY OPTIMIZED for cloud environments! While the core networking concepts apply everywhere, we've added SPECIAL FEATURES to handle those CRITICAL reserved IPs in AWS, Azure, and GCP that other calculators COMPLETELY IGNORE!

What's the EXACT Formula Behind Our Subnet Calculator?

We use the PRECISE mathematical formula that powers ALL networking: 2^n - 1, where n is the number of bits in the network portion. For example, with 3 network bits, that's 2^3 - 1 = 7, giving you a subnet mask of 255.255.255.248. Our calculator does this INSTANTLY so you don't have to!

Why Do We Show Binary Values When Others Don't?

Because we're SERIOUS about networking! Subnetting is FUNDAMENTALLY binary at its core. By showing you the binary representation, we help you VISUALIZE exactly how networks are divided - something other calculators HIDE from you! This is how REAL network engineers think!

What EXACTLY Is a Subnet Mask?

A subnet mask is a CRITICAL 32-bit number that DIVIDES IP addresses into two essential parts: network and host addresses. The first part identifies WHICH network a device belongs to, while the second part identifies the SPECIFIC device within that network. Get this wrong and NOTHING works!

Why Are Subnets ABSOLUTELY ESSENTIAL?

Subnets aren't optional - they're MANDATORY for modern networks! They deliver SUPERIOR IP allocation by dividing large networks into manageable chunks, DRAMATICALLY improve network performance by reducing broadcast traffic, and provide BULLETPROOF security by containing potential attacks!