The invention relates to a system and a method for addressing at least two subscribers ( 3, 4 ) that are redundant in respect of each other in a communication network ( 5 ), whereby the subscribers (3, 4 ) are each permanently assigned a first physical address ( 1, 9 ) that is unique in the communication network ( 5 ). To increase the availability of communication connections within the communication network, it is proposed that a group ( 6 ) of subscribers ( 3, 4 ) that are redundant in respect of each other should each be assigned a second physical address ( 2 ) that is unique in the communication network ( 5 ), whereby the second address ( 2 ) assigned to a group ( 6 ) can be activated and deactivated for the redundant subscribers ( 3, 4 ) in the group ( 6 ) respectively as the valid address in the communication network ( 5 ), whereby at least one higher-order unit ( 7 ) is provided respectively at one time to activate the second address ( 2 ) for just one of the redundant subscribers ( 3, 4 ) in the group ( 6 ) and to deactivate the second address ( 2 ) for the remaining redundant subscribers ( 3, 4 ) in the group ( 6 ).