CISA (Cybersecurity and Infrastructure Security Agency) is the DHS agency that manages the federal .gov domain registry and oversees civilian-government cybersecurity.
Per src-alien-gov-domains-2026-03, CISA verifies .gov registrants but does not audit or control how agencies use their registered domains — a distinction relevant to the unexplained March 2026 registrations of alien.gov and aliens.gov (see alien-gov-portal).
Acting EAD for Cybersecurity Chris Butera spoke on the record for the agency.