As the regulations on shrines formulated in 1871 decided the ranking of shrines based on the situation of those days, some shrines among the shikinaisha and the kokushigenzaisha (shrines appearing in the six official histories) were not given a ranking (these are called mukakusha).
明治4年の神社規則は当時の実状によって社格の上下を定めたものであったため、式内社や国史見在社の中には社格を与えられないもの（無格社）もあった。