If you live in USA, the tracking information should have been emailed to you by the USPS automated tracking email system right after your package was shipped. If you live in a foreign country, tracking information won't be available until the package arrives at your country's custom. Once...
Iceland Post, Japan Post, Landmark Global, South Africa Post, Swiss Post, Posten Norge (Norway), Uzbekistan, Elta Hellenic Post (Greece, ΕΛΤΑ), La Poste (France Post), India Post (भारतीय डाक), Spain Post (Correos España), Brazil Post (Correios Brasil), ...