End of a White House address Crossword Clue

 The answer to the crossword clue "End of a White House address" is GOV.

This is because the official website of the White House is www.whitehouse.gov. The "gov" suffix is used for government websites in the United States.

Here are some other possible answers to the clue:

gov

edu

com

net

org

mil

The specific answer that is correct will depend on the context of the crossword puzzle.