Apple · Pre-2021 Serials

Legacy Apple Serial Decoder

Older Apple serial numbers were not random. Twelve characters recorded the plant that assembled the device, the week it came off the line, and the exact model and configuration it shipped as. Paste one in to read it — then read below for the things an old serial number cannot tell you, which matter just as much if you are about to buy the device.

Serial number

Find the serial in Settings → General → About, or engraved on the case.

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The Old Scheme

What Twelve Characters Used to Give Away

Until late 2020 Apple issued serials in a structured 12-character format, and that structure carried real information. The characters are not a key into a database somewhere; they are the record itself. Decode them and you have the assembly plant, the week of manufacture, and the model and configuration the device left the line as. On an old machine the last of those is the one that earns its keep: it is a flat answer to what the hardware actually is, regardless of what the listing in front of you claims.

Newer serials are randomised and hold nothing at all. Apple changed the scheme at the end of 2020, so this decoder applies to hardware built before that point and has nothing to say about anything after it. Two further limits are worth stating plainly. The date you get is when the device was built, not when it was sold or first switched on, so it sets an earliest possible age rather than proving one. And none of this says anything about who owns the device, whether it is locked to an account, or whether it has been reported stolen — separate questions, with separate answers.

Reading the Twelve Characters

F2LGR1CLFLKN1

Chars 1-3

Assembly Plant

Chars 4-5

Year and Week Built

Chars 6-8

Unit Identifier

Chars 9-12

Model and Configuration

FAQ

Frequently Asked Questions

Will this read a recent Apple serial number?

No, and nothing else will either. Apple moved to randomised serials in late 2020, so an iPhone 12 or later, or an M1 Mac or later, carries a string with no structure in it to unpick. This decoder is for the older 12-character format only. If a modern serial is what you are holding, the useful question is what cover and what status the device carries, rather than what its characters mean.

What does an old serial number actually tell you?

Three things. Which plant assembled the unit — Foxconn Zhengzhou and Quanta Shanghai are among the codes that turn up. Roughly when it was built, to the year and the week. And the precise model and configuration, which is the part that catches a listing describing the wrong variant. It tells you nothing about condition, ownership or warranty.

Why did Apple abandon the structured format?

Privacy and security. A structured serial published manufacturing detail about every unit sold, and a predictable pattern is a pattern somebody can imitate — plausible-looking serials could be generated rather than observed. Randomising them closed both gaps, at the cost of the information this page exists to decode.