Thirty-three states have putative father registries. Ohio is one of them. If you haven't heard of it, don't get down on yourself. As many familiar with this particular area of family law are aware, such programs often exist in obscurity.
Putative Father Registries have been around for more than 30 years. The intent behind them is to provide an unmarried man who may be the father of a child notice from the government if the mother decides to give the child up for adoption.
It must be noted that the registry does not represent the exercise of parenting rights. The focus is on sharing information and creating opportunities for a biological father to act. To establish and pursue your rights, it is always best to consult with an attorney about available options.