NSF has recently announced that its headquarters will be moving to Alexandria, Virginia. Effective Monday, October 2, 2017, NSF's new mailing address will be as follows:
National Science Foundation
2415 Eisenhower Avenue
Alexandria, VA 22314
Read more information about the move here.
As a result of the move, NSF.gov, Fastlane, and Research.gov will be temporarily unavailable from June 30th at 8 p.m. to July 4th at 6 p.m.:
The National Science Foundation (NSF) is moving its Data Center IT servers to the Foundation’s new headquarters in Alexandria, Virginia, from June 30 at 8:00 PM EDT through July 4 at 6:00 PM EDT, to prepare for NSF staff relocation in August 2017. This move has been scheduled around a holiday weekend to minimize the systems downtime and reduce the impact on the research community and NSF staff.
Please be advised that the NSF website, FastLane, and Research.gov will be unavailable from Friday, June 30 at 8:00 PM EDT until Tuesday, July 4 at 6:00 PM EDT. During this outage period, there will be no access to these websites, proposals cannot be submitted in FastLane, and project reports and cash requests cannot be submitted in Research.gov. However, previously saved information and uploaded documents in FastLane and Research.gov, including in-process proposals and reports, will be accessible after the Data Center move.