VSPIC
IP Tools

CIDR to IP Range Calculator — CIDR to IP Range Conversion

CIDR to IP range calculator — expand any prefix into start, end, and usable hosts.

Introduction

CIDR to IP range calculator — run cidr to ip range conversion on any prefix to see network, first host, last host, broadcast, and address counts.

How to use this cidr to ip range calculator tool

  1. Enter CIDR (e.g. 172.16.0.0/16).
  2. Click Convert.
  3. Review start, end, and host count.

What Is This Tool?

Given 10.0.0.0/24, cidr to ip range convert expands to network 10.0.0.0, usable 10.0.0.1–10.0.0.254, broadcast 10.0.0.255.

Same math as subnet planning — this tool focuses on start/end boundaries for runbooks and firewall documentation.

How to Use This Tool

  • Enter CIDR (e.g. 172.16.0.0/16).
  • Click Convert.
  • Review start, end, and host count.

Formula / Calculation Logic

Same as subnet math: mask applied to base address; broadcast = network | ~mask.

Examples

Sample inputs and expected outputs:

InputResult
192.168.0.0/24Start 192.168.0.1 — End 192.168.0.254
10.0.0.0/304 addresses — 2 usable (point-to-point)

Understanding Results

  • Start IP — first usable or network per prefix rules.
  • End IP — last usable host.
  • Broadcast — subnet broadcast address.

Use Cases

  • Documenting cloud subnets
  • Writing runbooks
  • Student labs

Benefits

  • No manual binary
  • Shows broadcast explicitly

Common Mistakes

Avoid these errors when using this network calculator:

Planning pitfalls

  • Omitting /prefix
  • Using host IP instead of network in CIDR field

References

Disclaimer

This calculator is for education, lab work, and network planning. Always verify production firewall, routing, and cloud VPC settings before deployment.

cidr to ip range calculator — frequently asked questions

A CIDR to IP range calculator applies standard IPv4 subnet math (RFC 950 / CIDR) to compute network boundaries, masks, and host counts without manual binary conversion.

You enter IPv4 addresses, masks, or CIDR notation. The calculator bitwise-ANDs the address with the mask to find the network ID, then derives broadcast, wildcard, and host ranges.

Use it during CCNA study, VPC design, firewall rule documentation, IPAM planning, and troubleshooting when you need quick confirmation of subnet boundaries.

Yes. VSPIC runs calculations in your browser with no account required.

These calculators focus on IPv4. For IPv6 prefix planning, use our IPv6 Test and IP Subnet Calculator IPv6 tab.

CIDR writes the prefix length after a slash (e.g. /24). It replaces legacy classful networks and is used in routing tables worldwide.

A subnet mask marks which bits belong to the network portion. A /24 equals 255.255.255.0 with 254 usable hosts in typical subnets.

Yes. RFC 1918 addresses (10.x, 172.16–31.x, 192.168.x) use the same subnet mathematics as public space.

Set all host bits to 1 in the subnet — bitwise OR of network address with the inverted mask.

Variable Length Subnet Masking uses different prefix lengths within one parent network to minimize wasted addresses.

It applies the subnet mask to a CIDR prefix and lists the first and last addresses in the block — the core of cidr to ip range calculator output.

Next step for cidr to ip range calculator

Continue with ip lookup on VSPIC.

IP Lookup

Related Tools

Explore more free VSPIC tools for IP, DNS, security, and network diagnostics.

Browse all toolsComparison guides

Trusted by Users Who Value Privacy

Always Free

No premium plan ever

100% Private

Files processed in browser

Instant Results

Convert in seconds

Works Everywhere

Any device, any OS