{"input":"5216100123","is_valid_nanp":true,"e164":"+15216100123","formatted":"(521) 610-0123","country_code":"+1","area_code":"521","region":null,"principal_city":null,"timezone":null,"current_local_time":null,"note":"An area code only shows where a number is registered, not who is calling. Caller ID can be spoofed, so the code alone is not proof a call is local, safe, or fraudulent.","area_code_url":"https://areacode.fyi/521","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}