You usually do not need a serial number to identify a model. A product name, A-number, hardware identifier or chip is often enough to find the right device in ModelGuide.
Start with the information already shown on the device. Then enter one of these values in Search Beta.
Open Settings → General → About. The product name is shown there. At Model Number, iOS or iPadOS may initially show a part number; tap it to reveal the A-number. That A-number is especially useful for identifying the exact regional model.
Choose the Apple menu → About This Mac to see the model name, chip and other basic information. For a technical model identifier, open System Information and look in the hardware overview. ModelGuide can use both the familiar product name and identifiers.
Open the Watch app on the paired iPhone and go to General → About. The model information is listed there. Tapping the model number can reveal the A-number used to distinguish specific versions.
On an iPhone or iPad, open Settings and select your AirPods, or use Bluetooth and the information button next to them. The model number is shown in the device information. The charging case can have its own model number as well.
Use the most specific value you can find. An A-number or hardware identifier is usually more precise than only a family name such as “iPhone” or “MacBook”. Search Beta currently contains a small test database and will grow over time.
Open Search Beta