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WASHINGTON — The Obama administration, seeking to build on the momentum of the Iran resolution passed last week by the United Nations, announced Wednesday that it had imposed sanctions on more than a dozen Iranian companies and individuals with links to the country’s nuclear and missile programs.

The list includes two top commanders of the Islamic Revolutionary Guards Corps, which has control over Iran’s nuclear program and is expanding its grip on the nation’s economy.

It also includes a major Iranian bank and five front companies for the Iranian state shipping line, as well as 71 ships with names that had been changed to skirt previous sanctions.

“Iran will never cease looking for ways to evade our sanctions,” Treasury Secretary Timothy F. Geithner said in announcing the measures at the White House. “So our effort must be ongoing and unrelenting. And we will keep working on ways to intensify financial pressure on Iran.”

Administration officials said they hoped the steps would be the first of a new round of sanctions against Iran by the European Union, Australia and other countries.