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IP Subnet Calculator (IPv4 & CIDR Mask)

Computer networking and sysadmin tool. Breaks down IPv4 subnet mask and usable IP address space following IETF standards.

Input Parameters

CIDR Notation (Prefix /Bits)

Instant Calculation Result

Estimated Output

Active in Real-Time

Adjust values on the left to calculate live results.

Formula: Total IP Addresses = 2^(32 - CIDR). Usable Hosts = max(0, Total - 2).

In-Depth Guide & Mathematical Methodology

🌐 IPv4 CIDR Mask Cheat Sheet

/24: 255.255.255.0 (254 Usable Hosts)

/27: 255.255.255.224 (30 Usable Hosts)

/16: 255.255.0.0 (65,534 Usable Hosts)

Frequently Asked Questions (FAQ)

What is the IP Subnet Calculator (IPv4 & CIDR Mask) and how does it work?

Computer networking and sysadmin tool. Breaks down IPv4 subnet mask and usable IP address space following IETF standards.

How do I use this IP Subnet Calculator (IPv4 & CIDR Mask)?

Select CIDR Prefix Notation (e.g. /24 for 256 IPs, /16 for 65,536 IPs). View Usable Host Count, Dotted Decimal Mask, and total subnet IP addresses.

What mathematical formula is used in this calculation?

Total IP Addresses = 2^(32 - CIDR). Usable Hosts = max(0, Total - 2).

Is the IP Subnet Calculator (IPv4 & CIDR Mask) on FindCalculator free to use?

Yes, all 330+ interactive tools on FindCalculator.online are 100% free, run directly in your browser without registration, and do not store your private calculation data.

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