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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The question seems to misunderstand some IP address concepts. For example, 12.34.56.00 is a valid IP, leading 0s are absolutely fine (although unnecessary), and a few other things. Because of this, I don't think there is any "best practice" for this question and it could be teaching bad practices in terms of IP address validation.