CIDR Trainer
IPv4 and IPv6 subnet drills
Archived App (Last seen on 26 Dec 2025)
This is an archived listing of the app previously available on the App Store.Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.
About
Master network subnet calculations with targeted drills and integrated documentation. Practice IPv4 and IPv6 subnetting, address shortening, and terminology. Includes calculators and progress syncing across devices.
What's New in CIDR Trainer
1.2
March 1, 2022
Fixed a bug that could cause a crash in IPv4 address type drill Fixed an error in the IPv6 address lengthening drill for :: and ::1 cases Several cosmetic fixes Changed iOS support to start at 15.0 instead of 15.2
MoreIn-App Purchases
Free
Full Unlock
Unlocks all CIDR Trainer features forever
Developer apps
FAQ
How many drills can I try for free in CIDR Trainer?
You can try each training drill for free up to 20 times. After this limit, you can access other drills or purchase a permanent unlock for all features.
What is the price of the full unlock for CIDR Trainer?
The price for the 'forever full-unlock' is available in your region via in-app purchases. One purchase unlocks all versions of the app across iOS, iPadOS, and macOS.
Does CIDR Trainer have ads?
No, CIDR Trainer does not contain advertisements. The app is free to download and offers an optional in-app purchase for full functionality.
What devices is CIDR Trainer compatible with?
CIDR Trainer is compatible with macOS, iPhone, iPad, and iPod devices. It utilizes iCloud to sync your drill progress across these platforms.
How often is CIDR Trainer updated?
The latest version, 1.2, was released on March 1, 2022. The initial release was on February 20, 2022, indicating relatively frequent updates for a developer tool.
What kind of subnetting drills does CIDR Trainer offer?
CIDR Trainer offers a wide range of drills including IPv4 and IPv6 CIDR drills, hexadecimal and binary conversions, address shortening/lengthening, and terminology drills.
Can I get help while using CIDR Trainer?
Yes, each training drill in CIDR Trainer features a 'help' button located in the top-right corner. This button provides access to related documentation for assistance.
What is the age rating for CIDR Trainer?
CIDR Trainer has an age rating of 4+. This indicates it is suitable for a broad audience, including younger learners interested in network concepts.
