Following the Iranian Revolution of 1979, the United States imposed sanctions against Iran and expanded them in 1995 to include firms dealing with the Iranian government. In 2006, the UN Security Council passed Resolution 1696 and imposed sanctions after Iran refused to suspend its uranium enrichment program. U.S. sanctions initially targeted investments in oil, gas and petrochemicals, exports of refined petroleum products, and business dealings with the Iranian Revolutionary Guard Corps. This encompasses banking and insurance transactions (including with the Central Bank of Iran), shipping, web-hosting services for commercial endeavors, and domain name registration services.