DOI name consists of two main components: prefix, and suffix which separated by the character “/”. Prefixes starts with the number 22, which identifies the Global Handle Registry (GHR) of CITC followed by digits assigned to identify a unique naming authority Local Handle Service (LHS), which is a four or more digits.
22.1001 (prefix example)
The suffix part is a string chosen by the registrant (LHS). A naming authority can register as many suffixes under its prefix.
22.1001/NewDoi123SPhone (DOI example)