Iowa Code Title XII. Business Entities [Chs. 486-504C] § 504.504. Service on corporation

1. A corporation's registered agent is the corporation's agent for service of process, notice, or demand required or permitted by law to be served on the corporation.

2. If a corporation has no registered agent, or the agent cannot with reasonable diligence be served, the corporation may be served by registered or certified mail, return receipt requested, addressed to the secretary of the corporation at its principal office shown in the most recent biennial report filed pursuant to section 504.1613. Service is perfected under this subsection on the earliest of any of the following:

3. This section does not prescribe the only means, or necessarily the required means, of serving a corporation. A corporation may also be served in any other manner permitted by law.