Amazon does not use a single delivery company. Depending on your address, the item, and how fast you paid to get it, an order can be handed to Amazon's own last-mile network — Amazon Logistics (AMZL) — or to a national carrier such as USPS, UPS, or FedEx, or to a regional carrier like OnTrac. Amazon chooses the carrier at dispatch to balance speed and cost, which is why two orders placed the same day can arrive with completely different tracking.
That routing is also why the tracking number on your Amazon order page can look unfamiliar. Amazon Logistics deliveries use Amazon's own TBA numbers, which only resolve on Amazon's site and its delivery notifications — not on USPS or UPS. Standard and lighter items are frequently passed to USPS for the final mile, faster or heavier orders often go to UPS, and some regions still see FedEx or OnTrac. When a third-party Marketplace seller fulfills the order themselves rather than through Fulfilled by Amazon, they may use any carrier at all, so the number can belong to a company Amazon never touches.
This page lists the carriers known to deliver Amazon orders in 2025–2026, what each one does, and how to recognize their tracking numbers. If you'd rather not guess which site to paste your number into, 24hTrack auto-detects the carrier across 3,200+ networks and follows the parcel through every handoff in one timeline.
Amazon's own last-mile delivery network — branded vans, contracted Delivery Service Partners, and Amazon Flex gig drivers. It handles a large share of Prime and same-day/next-day deliveries in metro areas, completing the final mile itself rather than handing the parcel to a national carrier. AMZL tracking updates appear on Amazon's order page and delivery notifications rather than on a third-party carrier site. Tracking numbers: Amazon-issued numbers beginning with TBA (occasionally TBC or TBM) followed by digits (e.g., TBA303976474000)
A common final-mile carrier for standard and lighter Amazon orders, PO boxes, and rural addresses that Amazon's own vans don't cover economically. Amazon hands the parcel to USPS for delivery, and tracking then follows the USPS scan network. Tracking numbers: Long all-numeric strings, most commonly beginning with 9
Frequently used for heavier items, expedited shipments, and some Marketplace seller orders. UPS carries the parcel end-to-end once Amazon tenders it, so the full timeline appears under the UPS tracking number. Tracking numbers: Starts with 1Z followed by 16 characters (e.g., 1Z999AA10123456784)
Used for a portion of Amazon deliveries and commonly for third-party Marketplace orders shipped outside Fulfilled by Amazon. FedEx handles the parcel through its own Ground or Express network. Tracking numbers: 12- to 14-digit all-numeric tracking numbers (occasionally longer)
A regional last-mile carrier, strongest in the Western United States and expanding, that Amazon uses in some areas for faster metro deliveries. It completes the final mile with its own driver network instead of a postal handoff. Tracking numbers: Tracking numbers typically start with a letter (often C or D) followed by digits
It depends on your address, the item, and the shipping speed. Many orders are delivered by Amazon Logistics (AMZL), Amazon's own last-mile network of branded vans and gig drivers, especially for Prime deliveries in metro areas. Others are handed to USPS for lighter or rural deliveries, to UPS for heavier or expedited orders, and to FedEx or OnTrac in some regions. Amazon picks the carrier at dispatch, so it can differ from one order to the next.
A tracking number that starts with TBA is an Amazon Logistics (AMZL) number, issued by Amazon for parcels delivered by its own last-mile network. TBA numbers only resolve on Amazon's order page and delivery notifications — they will not work on USPS, UPS, or FedEx sites, because those carriers never handled the parcel. If your Amazon tracking shows a TBA number, the delivery is being made by Amazon itself.
Because the parcel is being delivered by a different carrier than the one you tried. Amazon Logistics TBA numbers only work on Amazon; a USPS number only works on USPS. If you paste an Amazon order number or a TBA code into a national carrier's site it will show nothing. Checking the carrier that actually has the parcel — or letting a tracker auto-detect it — avoids the mismatch.
Short quiet periods are normal, especially overnight and between the last hub scan and the out-for-delivery scan. Amazon Logistics often shows fewer intermediate scans than USPS or UPS, so a package can jump from 'shipped' to 'out for delivery' with little in between. If tracking stalls for more than a couple of days after a hub scan, contact Amazon through the order page — they can confirm the carrier and the delivery status.
Check around side and back entrances, mailrooms, parcel lockers, and with household members or neighbors first — parcels are sometimes scanned delivered shortly before the actual drop-off and appear within a day. If it still hasn't turned up, open the order on Amazon and use its delivery-problem flow; Amazon typically reships or refunds within its guarantee, and the delivering carrier can often confirm where the parcel was left.
There is no single format, because Amazon uses several carriers. An Amazon Logistics delivery shows a TBA number followed by digits. A USPS handoff shows a long all-numeric string, usually starting with 9. UPS uses a 1Z code, and FedEx uses a 12- or 15-digit number. Third-party Marketplace sellers may use any carrier, so the number can belong to a company Amazon never touched — all of them still refer to your order.
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