References / State open-data portals
Dataset2026
CISA dotgov data — the authoritative U.S. federal .gov domain registry
Cybersecurity and Infrastructure Security Agency (CISA)
The authoritative list of U.S. federal .gov domains, used to confirm a .gov is federal (and thus public domain) rather than an unlisted state domain.
Citation: CISA. dotgov-data (current-federal.csv).
Backs these rules
jurisdiction-domains