This object contains an unused value for fsDhcp6SrvKeyIndex in the fsDhcp6SrvKeyTable, or a zero to indicate that next index does not exists. This object will give the first empty index value for example when user create the four rows of fsDhcp6SrvKeyIndex with index 2,5,6,8.Then fsDhcp6SrvRealmKeyTableNextIndex object will return the value 1 as next unused Index.