Communications Sector
Department of Homeland Security

PPD-21 identifies the Communications Sector as critical because it provides an “enabling function” across all critical infrastructure sectors. The sector has evolved from predominantly a provider of voice services into a diverse, competitive, and interconnected industry using terrestrial, satellite, and wireless transmission systems. The Communications Sector-Specific Plan details how the National Infrastructure Protection Plan risk management framework is implemented.

*Currently in development

Mission Support


Case Study


The Communications Sector is reliant upon HIFLD data. Refer to the “Communications” subcategory in the HIFLD data catalog at:

* To request HIFLD data, please contact the HIFLD helpdesk at

Updated on March 31, 2020