Before you start
What you need
One valid IPv4 or IPv6 CIDR value.
Developer & Data
IP Address Calculator
Calculate exact IPv4 or IPv6 CIDR network boundaries, size, and address classification.
- 01Runs in this browser
- 02Limits are explicit
- 03Copy or download output
No black box
How this tool handles the input
A standards-oriented IP parser converts address bytes to exact integers, applies the prefix mask, and formats network boundaries without floating-point arithmetic.
What you get
What the page gives back
Network range, total addresses, classification, and IPv4 host/broadcast details where applicable.
Keep in mind
Use the result responsibly
Usable-host conventions vary for reserved ranges, point-to-point links, cloud subnets, and provider policies. Confirm the target network rules.
Practical uses
Where this tool earns its place
- Plan a development subnet.
- Check the network containing a logged address.
- Compare IPv4 and IPv6 prefix sizes.
Verified data boundary
Source text stays on this page.
The published contract marks these tools as client-only processing. Nirmion uses the API only to confirm that this workspace is enabled in MySQL; source values and results are not sent to Flask.