DENNIS M. COTA, Magistrate Judge.
Plaintiff, a prisoner proceeding pro se, brings this civil rights action pursuant to 42 U.S.C. § 1983. On February 19, 2019, the court ordered the United States Marshal to serve the complaint on defendants. Process directed to defendant H. Given and John R. Songs was returned unexecuted because there is no record of H. Given or John R. Songs. Plaintiff must provide additional information to serve this defendant. Plaintiff shall promptly seek such information through discovery, the California Public Records Act, Cal. Gov't. Code § 6250, et seq., or other means available to plaintiff. If access to the required information is denied or unreasonably delayed, plaintiff may seek judicial intervention. Once additional information sufficient to effect service is obtained, plaintiff shall notify the court whereupon plaintiff will be forwarded the forms necessary for service by the U.S. Marshal. Plaintiff is cautioned that failure to effect service may result in the dismissal of unserved defendants.
Accordingly, IT IS HEREBY ORDERED that plaintiff shall promptly seek additional information sufficient to effect service on any unserved defendants and notify the court once such information is ascertained.