Ind. Code § 8-23-9-35
Notice under section 34 of this chapter shall be mailed to the person, firm, limited liability company, or corporation by certified mail to the last known address. If the address of the person, firm, limited liability company, or corporation is unknown, the notice shall be given by publication once each week for two (2) successive weeks in two (2) newspapers of general circulation published in the county or counties where the contract with the department was performed. In a notice given by publication, the names of all persons, firms, limited liability companies, or corporations who have filed claims against the contractor and who have not been notified by mail may be included. Notice under this section must state that action must be filed on the claim within ninety (90) days of the date of the notice.
IC 8-23-9-35