CIDR

akira ohmachi Utilities iPhoneiPadiPod touch

CIDR is a free Utilities app for iPhone and iPad by akira ohmachi. Rated 5.0/5 from 1 ratings. Requires iOS 15.6. Updated June 21, 2026.

Rating: 5.0; 1 ratings
Price: Free; on the App Store
Size: 23 MB; Age 4+
Updated: Jun 21; 2026 · v2.11.0

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About CIDR

Calculate the IP address range from the IP address and subnet mask. It can be used to calculate IPv4 addresses, including prefix display, number of address ranges, and bit notation. CIDR calculation, when you want to check CIDR notation quickly. To convert subnet mask to CIDR notation. It can also be used as a quick reference table for subnet masks. Bit notation is also available, so it is suitable for learning IPv4.

What’s new

Version 2.11.0 · Updated 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.

App privacy

The developer, akira ohmachi, reported these privacy practices to Apple.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

Identifiers: Device ID

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

Identifiers: Device ID

Used for: Third-Party Advertising, Analytics, App Functionality

App details

CIDR is a free Utilities app for iPhone, iPad and iPod touch, developed by akira ohmachi. It is rated 5.0 out of 5 from 1 ratings on the App Store, requires iOS 15.6 or later and is 23 MB to download. It was first released on April 23, 2021 and last updated on June 21, 2026.

Category: Utilities
Rating: 5.0 / 5 (1 rating)
Price: Free
Version: 2.11.0
Size: 23 MB
Requires: iOS 15.6 or later
Compatibility: iPhone, iPad, iPod touch
Languages: English
Age rating: 4+
Released: April 23, 2021
Last updated: June 21, 2026
Developer: akira ohmachi

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Alternatives to CIDR

Looking for apps like CIDR? Here are 6 similar apps on the App Store. The highest rated is CIDR Calc (5.0/5), and all 6 are free to download.

CIDR vs. alternatives
App	Rating	Price	Last updated	Compare
CIDR	5.0 / 5 (1 rating)	Free	June 21, 2026
CIDR Calc	5.0 / 5 (1)	Free	Dec 12, 2025	Compare
IP Calcpad	–	Free	Feb 6, 2025	Compare
Network Helper	–	Free	Oct 6, 2026	Compare
Subnet Calculator +	4.0 / 5 (7)	Free	Mar 3, 2026	Compare
About Subnet Mask	5.0 / 5 (1)	Free	Oct 30, 2023	Compare
Subnet Plus: Subnet Calculator	4.7 / 5 (57)	Free	Oct 21, 2026	Compare

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