IPv4 and IPv6 subnet calculator.

Our free subnet calculator provides detailed information for both IPv4 and IPv6 subnets, including possible network addresses, usable host ranges, subnet masks, and IP classes, along with other relevant data.

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Subnet calculator.

  • IPv4 Subnet.

    Subnet AddressHost Address RangeBroadcast AddressUsable IPs
    192.0.0.0192.0.0.1 - 192.255.255.254192.255.255.25516777214
    Total addresses per Subnet No data
    Usable addresses per Subnet No data
  • IPv6 Subnet.

    Subnet AddressAddress Range
    0000000000000000000000000000000000000000000000000000000000000000 - 80000000000000000000000000000000
    Total Addresses per Subnet No data

How to use the IPv4 subnet calculator?

To use our IPv4 subnet calculator, start by entering the network address and selecting the subnet mask (from /8 to /32). You can also specify the number of hosts per subnet or the number of subnets. Once you’ve filled in the input fields, the calculator will display key subnetting details in a table format, including the subnet address, host address range, broadcast address, and usable IPs. Additionally, it will calculate the total number of addresses per subnet and the number of usable addresses per subnet. For your convenience, you can also export the IPv4 results as a CSV file.

How to use the IPv6 subnet calculator?

To use our IPv6 subnet calculator, simply input the network address and the number of subnets. After providing these details, the calculator will generate a table with key information, including the subnet address, address range, and usable IPs. It also computes the total number of addresses per subnet and the usable addresses per subnet. You can easily export the results as a CSV file for further use.

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Frequently Asked Questions.

  • What is a subnet calculator?

    A subnet calculator helps developers, DevOps engineers, and network administrators break down large IP networks into smaller, manageable subnets. It calculates important details like network addresses, subnet masks, and usable host ranges for both IPv4 and IPv6, making it easier to optimize network performance and manage IP address allocation. For DevOps teams, subnet calculators are especially useful when automating network configurations in cloud environments, managing scaling demands, and integrating with infrastructure as code (IaC) practices. By using one, you can streamline network design, reduce errors, and ensure that deployments follow best practices for network management.

  • Table of typical subnets for IPv4?
    Subnet MaskCIDR NotationNumber of HostsUsable HostsSubnet Description
    255.0.0.0/816,777,21616,777,214Very large network
    255.128.0.0/98,388,6088,388,606Half of a /8 network
    255.255.0.0/1665,53665,534Class B, medium network
    255.255.128.0/1732,76832,766Half of a /16 network
    255.255.255.0/24256254Class C, small network
    255.255.255.128/25128126Half of a /24 network
    255.255.255.192/266462Quarter of a /24 network
    255.255.255.224/273230Smaller subnetwork
    255.255.255.240/281614Very small subnet
    255.255.255.248/2986Used for point-to-point
    255.255.255.252/3042Point-to-point links
    255.255.255.254/3120Used for router links
  • What’s the difference between IPv4 and IPv6?

    IPv4 and IPv6 are two different versions of the Internet Protocol used to identify devices on a network, but they’re quite distinct in what they offer. IPv4 uses 32-bit addresses, which gives us about 4.3 billion possible addresses. As more devices have come online, we’ve run out of those addresses, which is where IPv6 comes in. IPv6 uses 128-bit addresses, giving us a nearly limitless supply—enough to comfortably connect every device now and in the future.

    Beyond the bigger address space, IPv6 also brings improvements like more efficient routing, better support for new services like multicast, and built-in security features such as IPsec. IPv6 was designed to address IPv4's shortcomings, making it more future-proof with additional features that help improve both performance and security.

  • What’s the difference between IPv4 and IPv6 subnetting?

    Subnetting in IPv4 and IPv6 serves a similar purpose—breaking up large networks into smaller parts—but it works differently because of how each version handles addresses.

    **IPv4** addresses are limited, so subnetting is all about making the most of what you have. You take a 32-bit address and divide it into network and host portions using subnet masks (like /24 or /28). It’s about squeezing the right number of addresses into the right size for each network.

    With **IPv6**, there’s no need to worry about running out of addresses. You’re working with 128-bit addresses, so the standard practice is to use /64 subnets, which provide an enormous number of IPs per subnet. Instead of worrying about conserving addresses, IPv6 subnetting is about logically organizing and dividing networks in a way that makes sense for growth and segmentation. This means it’s usually simpler and more focused on flexibility while still providing enough space for anything you might need.

    IPv4 subnetting is about using a limited resource efficiently, while IPv6 subnetting is about creating a logical structure with plenty of room to grow.

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