CIDR
CIDR Subnet calculator
About
This utility calculates IP address ranges from an IP address and subnet mask. It supports IPv4 calculations, including prefix display, address range counts, and bit notation. Useful for quick CIDR notation checks and subnet mask conversions.
What's New in CIDR
2.11.0
June 21, 2026
Added an option to remove ads. Improved the app to start smoothly without stopping, even if the network connection is unstable at startup.
In-App Purchases
$1.99
Remove Ads
Removes all ads from the app.
Developer apps
FAQ
What is CIDR used for?
CIDR (Classless Inter-Domain Routing) is used to represent IP addresses and their associated network prefixes more efficiently than traditional classful addressing. CIDR helps in IP address allocation and routing.
Does CIDR support IPv6?
Based on the provided description, CIDR focuses on IPv4 calculations. It details features like IPv4 prefix display and bit notation for IPv4 addresses.
How accurate is CIDR's subnet mask conversion?
The app is designed to accurately convert subnet masks to CIDR notation and calculate IP address ranges. It is rated 5.0 stars from 1 rating, indicating high user satisfaction with its functionality.
Is CIDR suitable for learning IPv4?
Yes, the app explicitly states it can be used for learning IPv4, offering bit notation and clear calculations of address ranges and prefixes.
What devices can I use CIDR on?
CIDR is available for iPhone, iPad, and iPod devices, making it accessible for users across the Apple ecosystem.
How often is CIDR updated?
The latest version is 2.11.0, and the last update was on June 21, 2026. This indicates a recent update, suggesting ongoing development and maintenance.
What is the age rating for CIDR?
CIDR has an age rating of 4+, meaning it is suitable for users of all ages and contains no mature content.
Does CIDR have ads?
No, the application does not contain advertisements. It is a free utility without any ad-supported elements.
