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Hours of Operation

Operating Hours

In observance of Presidents' Day, ARIN's office will be closed on Monday, 16 February, and reopen with normal operating hours on Tuesday, 17 February.

The ARIN office is open from 7:00 AM to 7:00 PM EDT, Monday through Friday. Outside operating hours, 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.


ARIN closes its office for the following holidays, and notes these closings at

ARIN 2015 Holiday Schedule
New Year's Day Thursday 1 January
Martin Luther King, Jr. Day Monday 19 January
Presidents' Day Monday 16 February
Memorial Day Monday 25 May
Independence Day Friday 3 July
Labor Day Monday 7 September
Thanksgiving Day Thursday 26 November
Day after Thanksgiving Friday 27 November
Christmas Holiday Thursday 24 December
Christmas Holiday  Friday 25 December 

The ARIN office also closes two hours early on 22 May, 4 September, 25 November, and 23 December.

Inclement Weather

Should the ARIN office close due to inclement weather or other extreme circumstance, such closings are noted at