first class international tracking usps is a service offered by USPS for international shipments using First-Class Package International Service. While it provides cost-effective rates for lightweight parcels, the tracking may be limited depending on the destination country. Some countries only update tracking until the parcel leaves the U.S., while others provide full end-to-end tracking. This service is often used by small businesses and individuals looking to save on global shipping without sacrificing basic visibility into their package’s progress.