With all due respect, I would like to inform you that, I spent a decent amount of time to find out existing post for my question.
Above post has been blocked with message of doing some research before posting the question. I am afraid to inform you that, I can not find any post which gives this detail.
Since you have blocked this post, I would request you to please provide one or two post which already provide this answer.
Moderators cannot read minds, it is mostly the initial post that is the basis for the decisions. You did not mention that you have searched for an available answer, and where.
Make sure to include all relevant information in your first post next time.
On the topic of your question that was locked, this is a very basic issue that can be answered for example by using the standard ABAP repository information system (SE90, SE84)
Similar type of questions have been locked before and will be locked in the future.
Using search tool you should have easily found one of the more than 200 threads/documents with table name SEOCLASS and restricting search to wiki you could have found help documents like Steps to find all Custom objects in database tables or sample reports like A Simple Class Browse Tool's Source Code or Information of Class Objects using CL_OO_CLASS.