The Federal Communications Commission's website, FCC.gov, included this message: "We regret the disruption, but during the Federal Government-wide shutdown, the FCC is limited to performing duties that are immediately necessary for the safety of life or the protection of property. FCC online systems will not be available until further notice."
The Federal Trade Commission's website was also closed. Consumers will not be able to file complaints or register for the agency's do-not-call list during the shutdown, the agency said.
The National Security Agency's website was up, but a message said it was not being updated.
Data.gov, the government's website for publishing agency data and statistics, was closed.
Also down are NASA.gov, Archives.gov, USDA.gov and Trade.gov, the website for the International Trade Administration.
Grant Gross covers technology and telecom policy in the U.S. government for The IDG News Service. Follow Grant on Twitter at GrantGross. Grant's email address is firstname.lastname@example.org.