If a party having a share or interest is unknown, or any one of the known parties resides out of the state or cannot be found, the summons may be served upon them by publication in accordance with the Utah Rules of Civil Procedure.
Utah Code § 78B-6-1206
Service by publication
Renumbered and Amended by Chapter 3, 2008 General Session
Official source: Utah State Legislature. Reproduced from public-domain Utah statutes; confirm against the official source for the current text. Not legal advice.