Mandiant® - Detect. Respond. Contain.


Whether it's an inquiry, assistance or you’re looking to learn more about Mandiant's products and services, we're excited to hear from you.

Washington, DC Headquarters

2318 Mill Road, Suite 500, Alexandria, VA 22314 (Google Map)

Tel: +1 (703) 683-3141 Toll Free: 1 (800) 647-7020 Fax: 1 (703) 683-2891

Mandiant Worldwide

San Francisco

135 Main Street
Suite 550
San Francisco, CA 94105
(Google Map)

New York

24 West 40th St.
9th Floor
New York, NY 10018
(Google Map)

Dublin, Ireland

3rd Floor, Block A,
Georges Quay Plaza
Georges Quay
Dublin 2, Ireland
(Google Map)

United Kingdom

200 Brook Drive
Green Park
+44 (0) 118 373 2700
(Google Map)

Los Angeles

841 Apollo St.
Suite 350
El Segundo, CA 90245
(Google Map)

Reston, VA

12012 Sunset Hills Road
7th Floor
Reston, VA 20190
(Google Map)

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Incident Response

If you need immediate assistance for a possible incident please call us at:

US Toll Free: +1 (866) 962-6342 UK Toll Free: 0800 047 0990 International: +1 (703) 996-3012

You may also email us at:

Product Support

Support cases pertaining to Mandiant software solutions, and non-security issues in Mandiant's product and services should be reported via the Mandiant Support Center or directly via the following methods:

US/Canada: +1 (877) 962-6342 Worldwide: +1 (703) 637-9377

Media Contact

Press and Media inquiries should be directed to Susan Helmick, by phone at +1 (703) 224-3547 or email to

Mandiant Managed Defense Support

Please contact your Threat Assessment Manager, listed in the MCIRT Portal, for related support.