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Home / IT & Cybersecurity Tools / IPv4 Subnet Calculator


NETWORKING TOOLKIT
IPv4 Subnet Calculator
Find your network address, broadcast address, subnet mask, wildcard mask and usable IP range. Free, fast and processed locally in your browser.


Calculate your subnet
Enter an IPv4 address and a CIDR prefix from /0 to /32.
Your address is calculated on this device. No IP lookup or server request is made.




What is an IPv4 subnet calculator?
An IPv4 subnet calculator determines the network boundaries of an IP address and CIDR prefix. It helps network administrators, cybersecurity analysts and students plan address ranges and check routing configurations.
How to use this calculator
  1. Enter an IPv4 address such as 192.168.1.100.
  2. Enter a prefix length such as 24.
  3. Select Calculate subnet to see the network, mask, broadcast and usable address range.
  4. Use Copy results to paste the output into your notes.
Worked example: 192.168.1.100/24
The /24 prefix means that 24 bits identify the network and 8 bits remain for addresses. The subnet mask is 255.255.255.0, the network is 192.168.1.0, and the broadcast address is 192.168.1.255. For an ordinary subnet, the usable range is 192.168.1.1 through 192.168.1.254, or 254 host addresses.
Frequently asked questions
What does /24 mean?
It specifies 24 network bits in a 32-bit IPv4 address. That leaves 256 total addresses, typically 254 usable host addresses.
What is a wildcard mask?
It is the bitwise inverse of the subnet mask. For /24, the wildcard mask is 0.0.0.255.
Why are /31 and /32 different?
A /31 is often used for point-to-point links under RFC 3021, with both addresses available as endpoints. A /32 represents one address, often used for host routes. These are not ordinary multi-host broadcast subnets.
Does this tool scan my network?
No. It performs mathematical calculations in your browser and does not probe or connect to any IP address.
Related networking tools
CIDR ConverterIPv4 Address ConverterAll YARVICO tools
Educational reference only. Verify addressing and routing decisions against your actual network design.








          

        

Wednesday, November 4, 2026


          

        









Hitachi Energy TRO600 Series Vulnerabilities: Critical Remote Code Executio












CISA has issued an advisory regarding critical vulnerabilities in Hitachi Energy's TRO600 series industrial control systems. These flaws enable remote code execution (RCE) and sensitive information disclosure, posing significant risks to energy infrastructure.


    

  • Two critical vulnerabilities (CVE-2026-10756 and CVE-2026-106087) affect specific TRO600 versions
    • 

  • Both vulnerabilities have CVSS scores of 7.5 (high severity) with critical infrastructure implications
    • 

  • Products are deployed globally across energy sectors with headquarters in Switzerland
    • 



Recommended immediate actions include updating to the latest secure versions: TRO600 9.2.2.1 for most affected products and TRO600 9.1.2.0 for older versions.


Organizations should implement network segmentation to isolate control systems from internet access and apply strict firewall configurations to minimize exposure.
Official source: Hitachi Energy TRO600 series products (2026-10-29T12:00:00.000Z). Yarvico provides independent educational analysis.








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