"Numeric" ciphers are a form of substitution ciphers, but have been designated with their own mode as they have many unique properties of their own. If your message is not solved using the basic numeric algorithyms, it may be a form of Book Cipher
. You can solve or create book ciphers by entering a conversion base in the "Base" field. For example, if you wanted to perform the 2nd Beal cipher
, you would enter the Declaration of Independence in the "Base" field!