CPV code 72315100 designates Data network support services in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
72315100 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 72315000 (Data network management and support services).