This read-only object reports one OSI area address advertised by the neighbor in its IIH PDUs; a neighbor may report multiple area addresses, each appearing as a separate instance in this table. It lets an administrator confirm that a Level 1 neighbor shares at least one common area with this router, since Level 1 adjacencies require matching areas to be useful for intra-area routing. For example, discovering that csIsisISAdjAreaAddress for a supposed Level 1 neighbor lists only a different area explains why the adjacency, though up, never contributes any Level 1 routes.