The invention concerns a network element (4) for a telecommunication network (1) and a method of mapping address information according to a network numbering plan of the telecommunication network (1) to service access codes or network element addresses. The network element (4) receives address information according to the network numbering plan of the telecommunication network (1) and extracts a search key from the received address information. It provides a memory (42) with a data structure for representing, retrieving and modifying translation information mapping address information according to the network numbering plan to service access codes or network element addresses. The data structure has a tree structure with nodes and leaves operatively chained together wherein at least one of the nodes holds information nominating which part of the search key will be used to determine the branching of the respective node. The network element (4) applies the search key on the data structure of the memory by a key walk logic searching the key structure, the key walk logic extracts the part of the search key nominated by the respective node and determines the branching of the node by means of the extracted part of the search key.