N.D. Cent. Code § 26.1-02-10
Any act of transacting insurance business as set forth in this chapter by any unauthorized insurance company is an irrevocable appointment by the company, binding upon the company, its executor or administrator, or successor in interest if a corporation, of the secretary of state or the secretary's successor in office, as the attorney of the company upon whom may be served all lawful process in any action or proceeding in any court by the commissioner or by the state and upon whom may be served any notice, order, pleading, or process in any proceeding before the commissioner and which arises out of transacting insurance business in this state by the company. Any act of transacting insurance business in this state by any unauthorized company signifies its agreement that any lawful process in any court action or proceeding and any notice, order, pleading, or process in any administrative proceeding before the commissioner so served is of the same legal force and validity as personal service of process in this state upon the company.
N.D.C.C. § 26.1-02-10