Method for determining communication device addresses within a communication network of an industrial automation system, in which - at least one computer unit of a communication network name service provides name service information relating to assignments between communication device names and communication network addresses according to a name resolution protocol, - a storage unit (12, 22) is respectively assigned to selected communication devices (1, 2) of the industrial automation system and respectively temporarily stores at least some of the name service information provided by the communication network name service, - for name resolution processes, the selected communication devices (1, 2) first of all retrieve the name service information temporarily stored in the storage units (12, 22) assigned to them, - a connection set-up from a first selected communication device to a second communication device is started, in the case of an application (11, 21) and/or function of the industrial automation system which is distributed among at least the first and second communication devices, on the basis of the name service information stored in the storage unit (12, 22) assigned to the first communication device (1, 2), - in the event of a failed attempt to set up a connection, the application (11, 21) and/or function trigger(s) at least partial updating of the name service information stored in the storage unit (12, 22) assigned to the first communication device (1, 2), characterized in that - a replacement communication device, if a communication device is replaced with the replacement communication device, transmits a registration request to the computer unit of the communication network name service, - in the event of renewed failed attempts to set up a connection, the application (11, 21) and/or function trigger(s) the at least partial updating of the name service information stored in the storage unit (12, 22) assigned to the first communication device (1, 2) at intervals of time which increase with each failed attempt to set up a connection. - at least one computer unit of a communication network name service provides name service information relating to assignments between communication device names and communication network addresses according to a name resolution protocol, - a storage unit (12, 22) is respectively assigned to selected communication devices (1, 2) of the industrial automation system and respectively temporarily stores at least some of the name service information provided by the communication network name service, - for name resolution processes, the selected communication devices (1, 2) first of all retrieve the name service information temporarily stored in the storage units (12, 22) assigned to them, - a connection set-up from a first selected communication device to a second communication device is started, in the case of an application (11, 21) and/or function of the industrial automation system which is distributed among at least the first and second communication devices, on the basis of the name service information stored in the storage unit (12, 22) assigned to the first communication device (1, 2), - in the event of a failed attempt to set up a connection, the application (11, 21) and/or function trigger(s) at least partial updating of the name service information stored in the storage unit (12, 22) assigned to the first communication device (1, 2), - a replacement communication device, if a communication device is replaced with the replacement communication device, transmits a registration request to the computer unit of the communication network name service, - in the event of renewed failed attempts to set up a connection, the application (11, 21) and/or function trigger(s) the at least partial updating of the name service information stored in the storage unit (12, 22) assigned to the first communication device (1, 2) at intervals of time which increase with each failed attempt to set up a connection.