Haw. Rev. Stat. § 231-64: Tax liens; registered land.

If the land has been registered in the land court, the state tax collector shall also send by registered mail a notice of the proposed sale to any person holding a mortgage or other lien registered in the office of the assistant registrar of the land court. The notice shall be sent to any such person at the person's last address as shown by the records in the office of the registrar, and shall be deposited in the mail at least forty-five days prior to the date set for the sale.