IP Subnet Calculator
You should know how to subnet in order to design and manage an efficient IP network—and that is what our subnet mask calculator guides you to do. Ideal for IT students, network engineers or systems admins, this tool makes complicated looking subnetting into simple, actionable data on IPv4 and IPv6 subnets.
What is the Functionality of the Subnet Calculator?
You go ahead and use our calculator with any valid IP address + prefix length or CIDR notation and you will get instantly:
- Network Address
- Broadcast Address
- Subnet Mask
- Range of IP Addresses
- First and Last Usable IPs
- Wildcard Mask
- Number of Hosts per Subnet
- Total Number of Subnets
- Network Class (A, B, C, etc.)
No manual calculations, no second-guessing. Just fast, accurate results.
Why use a subnet calculator?
In contemporary networking there is a need to segment large address spaces into smaller networks for performance, scalability and security purposes. There are many advantages of subnetting such as reducing the broadcast traffic, optimizing address space and each subnet can use a different routing protocol and subnetting helps us achieve all those things.
With our IPv4 subnet calculator, you can now put all of that behind you and concentrate on design and implementation instead of bits and bytes crunching.
Key features
- Provides complete support for both IPv4 and IPv6
Seamlessly transition between IPv4 and IPv6 subnets to meet project requirements - CIDR and Class-Based Subnets
Identify Classless Inter-Domain Routing (CIDR) and how it differs from traditional IP class-based subnetting. - Wildcard Mask Calculation
The wildcard mask appears next to the subnet mask and is used in firewall rules and access lists. - Real-Time Updates
Change the prefix length/number of bits, and see how quickly the range of IPs, network prefix and no of hosts changes as well.
Who should use this tool?
Simplifying IP Address Planning
Whether you are preparing for a networking certification or operating enterprise infrastructure, this tool simplifies the complexity. It’s ideal for:
- Network engineers & architects
- Cybersecurity professionals
- CCNA/CCNP students
- Cloud and DevOps teams
- System administrators
Understand the essentials of subnetting
Subnetting is not only about dividing a network into smaller networks; it is also about making optimal use of IP addresses and planning appropriately. The tool assists you in understanding how network addresses, prefix lengths, and broadcast domains combine to create scalable networks.
Try the calculator now
Simply enter your IP address, specify the network prefix or CIDR notation as per your requirement and leave the rest to the tool. Check out our calculator here: IP Subnet Calculator
Our IP subnet calculator is accurate, clear, and quick — every time!
Frequently Asked Questions (FAQs)
Subnet mask is a 32-bit number in IPv4 networks, which divides the RGB address into a network and host portion. This is useful for figuring out which portion of the address is the network prefix and which part is the host.
A subnet mask calculator that accepts an IP address and either a CIDR notation or a prefix length, and returns the network address, broadcast address, range of IP addresses, number of hosts, and wildcard mask.
CIDR ( Classless Inter-Domain Routing ) is a more efficient way to allocate IPs. Instead of the traditional class-based system, CIDR uses prefix lengths (such as /24) to define subnet sizes.