{"input":"2312939520","is_valid_nanp":true,"e164":"+12312939520","formatted":"(231) 293-9520","country_code":"+1","area_code":"231","region":"Michigan","principal_city":"Muskegon","timezone":"America/New_York","current_local_time":"2026-08-14 09:08:18","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/231","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}