1w, x, y, and z are digits that indicate the street, part of the street, or even the building of the address 2x is a digit indicating the operator: 2 for the former national operator, Romtelecom, and 3 for the other ground telephone networks
Such administrative arrangement existed in an approximative similarity before 1989, when Constanța Municipality also included the city of Mangalia and the communes 23 August and Limanu, together with all the summer resorts located between 23 August and Mangalia (the so-called "Mangalia Nord" resorts area).
However this administrative reform exists only on paper, nothing being done so far to put this decision into practice (e.g. unified local administration and transportation)[citation needed].