Pursuant to Section 26 of Act No. 71/1967 Coll. on Administrative Proceedings (Administrative Procedure Code), service by public notice shall be used by an administrative authority where the parties to the proceedings or their place of residence are unknown to the authority, or where this is provided for by a special regulation.

Service by public notice shall be carried out by posting the document on the official notice board of the administrative authority for a period of 15 days. The last day of this period shall be deemed to be the day of service. The administrative authority shall simultaneously publish the document on its website, if it has one, and, where appropriate, by other means customary in the locality, in particular in the local press, radio, or on a temporary official notice board of the administrative authority at the place to which the proceedings relate.