I just sent an electronic report to the FTC about a call I received may 31, 2017 from this number in which some person or child read to me some kind of spiel twice claiming that I was eligible through random selection for a government grant for $7,000.  I told the caller that the government does not randomly select people to whom to give grant money.  I demanded the caller's name twice, and caller hung up!  I cannot imagine members of the federal work force calling people from this number in trying to perpetuate some kind of scam.  I'm afraid that I cannot enlighten you further about this D.C. number, either.  I reported my last call from it to the FTC.  This call which i received from this numbers as far as I am concerned was a very bizarre Do Not Call list violation.