Rule 4.1. Serving Other Process

(a) In General. Process—other than a summons under Rule 4 or a subpoena under Rule 45—must be served by a United States marshal or deputy marshal or by a person specially appointed for that purpose. It may be served anywhere within the territorial limits of the state where the district court is located and, if authorized by a federal statute, beyond those limits. Proof of service must be made under Rule 4 (l).

(b) Enforcing Orders: Committing for Civil Contempt. An order committing a person for civil contempt of a decree or injunction issued to enforce federal law may be served and enforced in any district. Any other order in a civil-contempt proceeding may be served only in the state where the issuing court is located or elsewhere in the United States within 100 miles from where the order was issued.

U.S. Code

Rule 4.1. Serving Other Process