This publication provides a concordance of numbering systems addressing the Early Egyptian inscriptions (Dyn. 0-3). The numbering system, which was originally introduced by J. Kahl (1994) and which was expanded by I. Regulski in her "Database of Early Dynastic inscriptions," is mapped on the numbering system defined by J. Kahl, N. Kloth and U. Zimmermann (1995) for the 3rd Dynasty inscription and on the numbering of P. Kaplony (IF, IFS, KBIF). An overview of the different systems and some background information are given in the introduction. Furthermore, as a final goal of this publication, the numbering system has been expended to provide a unique identifier for each inscription that can be used as a reference in databases and printed publications.