Various mail services and other companies offer package tracking numbers that can be checked online. PackTrack.com allows users to track packages from every major carrier at one integrated website.
Users input the tracking number, select the carrier from a drop down box and click "Track"; the website then redirects the user to the appropriate service. This website redirects users to the appropriate carrier's tracking website, but if the website is down, users can use the relevant carrier's tracking website directly. UPS tracking services are available at UPS.com/tracking by clicking the "Track Now" button. USPS tracking services are available at USPS.com/tracking, and FedEx tracking services are located at FedEx.com/FedExtrack. Each website allows the user to input the appropriate tracking number and receive detailed information about the corresponding package.