CIDR Calc
Subnet and host calculator
About
Calculate subnet details, including IP addresses, masks, and reverse masks, using CIDR notation. Generate and share lists of subnets and hosts within the next higher octet. This tool simplifies network calculations for IT professionals and students.
What's New in CIDR Calc
1.5.1
December 12, 2025
Bug fixes, new dark mode icon
Developer apps
FAQ
What is CIDR Calc used for?
CIDR Calc is used to display subnet details, IP addresses, masks, and reverse masks based on IP and CIDR notation. It also generates shareable lists of all subnets and hosts in the next higher octet.
Is CIDR Calc free to use?
Yes, CIDR Calc is available for free.
What devices does CIDR Calc support?
CIDR Calc is supported on iPhone, iPad, and realityDevice.
How often is CIDR Calc updated?
The latest version, 1.5.1, was released on 2025-12-12, indicating regular updates from the developer.
What is the age rating for CIDR Calc?
CIDR Calc has an age rating of 4+, making it suitable for a wide range of users.
Does CIDR Calc have ads?
No, CIDR Calc does not contain advertisements.
What is the user rating for CIDR Calc?
CIDR Calc has an excellent rating of 5.0 stars based on 1 review.
Can I share subnet information from CIDR Calc?
Yes, CIDR Calc allows you to generate and share lists of all subnets and hosts within the next higher octet.
