Neb. Rev. Stat. § 86-2,113

A subpoena of the Attorney General or a county attorney may be served by any person designated in the subpoena to serve it. Service upon a natural person may be made by personal delivery of the subpoena to him or her. Service may be made upon a domestic or foreign corporation, upon a partnership, upon a domestic or foreign limited liability company, or upon any other unincorporated association which is subject to suit under a common name, by delivering the subpoena to an officer, a managing or general agent, a member, or any other agent authorized by appointment or by law to receive service of process. The affidavit of the person serving the subpoena entered on a true copy thereof by the person serving it shall be proof of service.