; (ii) via the postal and e-mail address of the registrar, registry, or other domain name registration authority that registered or assigned the domain name, to the extent those addresses are reasonably available; and (iii) in any other such form as the court finds necessary, including as may be required by rule 4(f) of the Federal Rules of Civil Procedure. (B) Rule of construction For purposes of this subsection, the actions described in subparagraph (A) shall constitute service of process. (C) Other notice Upon commencing an action under paragraph (1), the Attorney General shall also provide notice to entities identified in the complaint, or any amendments thereto, that may be required to take action under paragraph (4). (4) Required actions based on court orders (A) Service (i) In general A Federal law enforcement officer, with the prior approval of the court, may serve a copy of a court order issued under paragraph (2) on similarly situated entities within each class described in that paragraph, that have been identified in the complaint, or any amendments thereto, filed under paragraph (1). (ii) Proof of service Proof of service made under clause (i) shall be filed with the court. (B) Reasonable measures (i) Operators (I) In general After being served with a copy of an order under this paragraph, an operator of a nonauthoritative domain name system server shall take the least burdensome technically feasible and reasonable measures designed to prevent the domain name described in the order from resolving to that domain name’s internet protocol address, except that— (aa) the operator shall not be required— (AA) other than as directed under this subclause, to modify its network, software, systems, or facilities; (BB) to take any measures with respect to domain name lookups not performed by its own domain name server or domain name system servers located outside the United States; or (CC) to continue to prevent access to a domain name to which access has been effectively disabled by other means