Several years old. Contact the number directly.

Cybersecurity and Infrastructure Security Agency issued these blocks several years ago. Customers swap carriers every few years, so Cybersecurity and Infrastructure Security Agency probably no longer holds them. Try calling any number you're interested in. If a person answers, you've found the current owner and can negotiate with them.

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About Office of The Manager National Communications Sys

The Office of The Manager National Communications System was the administrative office of the National Communications System (NCS), a former U.S. government entity under the Department of Homeland Security responsible for national security and emergency preparedness (NS/EP) telecommunications. It coordinated interconnectivity and survivability of federal agency communications facilities, primarily serving government agencies rather than commercial consumers, businesses, or wholesale markets. The NCS was disbanded in 2012 and merged into the DHS Office of Emergency Communications; any associated OCN and number blocks likely represented government-assigned resources rather than a commercial carrier operation.

Sources: National Communications System - Wikipedia · Agencies - National Communications System - Federal Register · National Communications System Joins Homeland Security Department - DVIDS

HQ: Arlington, VA

Street view of Cybersecurity and Infrastructure Security Agency HQ
Street view
Satellite view of Cybersecurity and Infrastructure Security Agency HQ
Satellite

Block portfolio at a glance

Area codes

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710 798 · ·

States

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XX 798 ·