Method for assigning a MAC address, and database with MAC addresses

A communication apparatus comprising:

• a computer device that hosts a database containing MAC addresses;
• the computer device configured to communicatively connect the database to a plurality of communication devices via a network to provide user-specific MAC addresses to the communication devices so that each of the user-specific MAC addresses are readable into a first communication device of the plurality of communication devices when a user of the user-specific MAC address logs into the network via the first communication device, each of the user-specific MAC addresses within the database comprising a hash value calculated via a defined hash algorithm from a telephone number assigned to a respective user to form a unique identifier for the user-specific MAC address of the user, the user-specific MAC address including the unique identifier so that pairing of the first communication device with a first near-filed communication device is performable such that the generated user-specific MAC address is utilizable to avoid a repeated pairing so the first near field communication device is utilizable with other communication devices of the plurality of communication devices after the user logs in to the other communication devices without undergoing another pairing.