This is the conceptual row (entry) definition for the classic MIB-1 Address Translation Table (atTable), representing one row mapping a network address to a physical (MAC) address for a given interface; the source MIB provides no DESCRIPTION text for this row object beyond its SYNTAX and table linkage. Network management tools use this deprecated table to see IP-to-MAC address mappings, a role now largely superseded by the ARP table in newer MIBs. For illustration, walking this table on an older device would return rows pairing IP addresses with the corresponding Ethernet MAC addresses learned on each interface.