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IPv4 Subnet Calculator



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JSON Formatter & Validator


URL Encoder / Decoder
Encodes URL components, not entire URLs.


SHA-256 Text Hash Generator
Uses Web Crypto in secure browser contexts. SHA-256 is not password encryption.


Local File Hash Checker
File contents stay in your browser. A 25 MB limit helps protect low-memory devices.


UUID v4 Generator


Unix Timestamp Converter


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Local, approximate heuristics only; not a breach check or proof of security. Avoid entering real sensitive passwords into unfamiliar sites.


IPv4 Address Converter


Text & Byte Counter


IOC Extractor
Extraction only; indicators are not verified as malicious. Inputs are not submitted to a threat intelligence service.


Scientific Calculator
Evaluate arithmetic expressions and powers.


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Add, subtract, multiply and divide fractions.


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Find a percentage of a number.


Random Number Generator
Generate a random integer within a range.


Triangle Calculator
Calculate triangle area and perimeter.


Standard Deviation Calculator
Calculate mean and standard deviation.


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Calculate age from a date of birth.


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Find days between two dates.


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Estimate concrete volume in cubic meters.


Conversion Calculator
Convert common length and mass units.


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Finance Calculator
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Gross pay estimate. Estimates only; check assumptions before making decisions.
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Implied annual loan APR. Estimates only; check assumptions before making decisions.
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How it works
Worked example and practical uses
Important limitations
Frequently asked questions
Is this tool free?
Yes. YARVICO provides this calculator without requiring an account.
Are the results always accurate?
Check the tool-specific limitations above. Verify important results against trusted independent references.
Do I need to install software?
No. This tool runs in a modern web browser.


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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


          

        









CISA Adds Two Exploited Vulnerabilities to KEV Catalog












CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog based on evidence of active exploitation: CVE-2026-111357 (Ivanti Connect Secure Missing Authentication for Critical Function Vulnerability) and CVE-2026-118527 (Ivanti Connect Secure Generation of Predictable Numbers or Identifiers Vulnerability).


These vulnerabilities pose significant risks to the federal enterprise and are frequent attack vectors for malicious actors.


Binding Operational Directive (BOD) 26-04 mandates that Federal Civilian Executive Branch (FCEB) agencies prioritize rapid remediation of high-risk vulnerabilities listed in the KEV Catalog on publicly exposed assets that grant total control post-exploitation.


CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities.
Official source: CISA Adds Two Known Exploited Vulnerabilities to Catalog (2026-10-30T12:00:00.000Z). Yarvico provides independent educational analysis.








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