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Hours of Operation

Operating Hours

Note: The ARIN office will be closed on Monday, 17 February in observance of Presidents' Day, and will reopen with normal operating hours on Tuesday, 18 February.

The offices of the American Registry for Internet Numbers (ARIN) are open from 7:00 AM to 7:00 p.m. ET, Monday through Friday. When our offices are closed, messages may be left for the ARIN Registration Services Help Desk (703-227-0660), ARIN's Billing Help Desk (703-227-9886), or on ARIN's main number (703-227-9840). Email to ARIN will continue to be processed when the office is closed; however in the event of holidays or closings due to inclement weather, responses or the processing of resource requests may be delayed.


Throughout the year, ARIN closes its offices for some holidays. These closings will be noted at The holidays ARIN's offices are closed are as follows:

ARIN 2014 Holiday Schedule
New Year's Day Wednesday 1 January
Martin Luther King, Jr. Day Monday 20 January
Presidents' Day Monday 17 February
Memorial Day Monday 26 May
Independence Day Friday 4 July
Labor Day Monday 1 September
Thanksgiving Day Thursday 27 November
Day after Thanksgiving Friday 28 November
Christmas Holiday Thursday 25 December
Christmas Holiday  Friday 26 December 

In addition, our offices will be closed 2 hours early on 23 May, 29 August, 26 November, and 24 December.

Inclement Weather

From time to time, ARIN may need to close its offices due to inclement weather or other extreme circumstances. When these conditions exist, there will be a notice posted at Normal operations will resume as soon as possible.