CD IFPI codes explained

The three strings on every modern CD

Pick up a CD and tilt it under a lamp with the label side facing you. Between the centre hole and the start of the data area there is a band of clear polycarbonate known as the mirror band. Etched into it, in characters barely a millimetre tall, you will typically find three separate pieces of information: the matrix string, an IFPI mastering SID code, and somewhere on the disc an IFPI mould SID code. Together they identify who cut the glass master, which machine moulded the plastic, and which release the disc belongs to.

None of this is printed on the tray card, and none of it is visible in a seller's photograph of the artwork. For CDs, where thousands of titles were repressed repeatedly with identical packaging, these codes are frequently the only way to distinguish an early target-era disc worth serious money from a supermarket repress worth pennies.

The matrix string

The matrix is the longest of the three, often running most of the way around the mirror band. Examples look like 7243 8 12345 2 6 01 *, DIDX-004352 2 or PDO A0100010283-A1 01 +. It usually embeds the catalog number, a glass-master or job number assigned by the plant, and often a sequence digit indicating which master of that title it was.

Plant conventions are recognisable once you have seen a few. DIDX numbers come from Disctronics/Sony's US operation. PDO strings indicate Philips and Du Pont Optical, whose discs from the early nineties are well known for bronzing. Made in Japan by JVC or Made in West Germany by PolyGram appear as plain text on the earliest CDs and are among the most sought-after markers in CD collecting, since West Germany ceased to exist in 1990.

The IFPI mastering SID code

The mastering Source Identification code always begins with the letter L — for example IFPI L553. It is laser-etched into the mirror band, usually close to the matrix string, and identifies the facility that produced the glass master from which stampers were made. The scheme was introduced by the IFPI in 1994 to combat piracy, so a disc with no mastering code at all was almost certainly manufactured before that date — a useful, if blunt, dating tool.

Codes are allocated in blocks by facility. L011 and its neighbours belong to Sony DADC in Anif, Austria. The L55x range covers EDC in Blackburn and Germany. L133 is PMDC in the United States. L2xx codes are commonly Japanese plants. Because the mastering code is fixed to the glass master rather than the individual disc, every copy struck from that master shares it, which makes it an excellent way to group pressings together.

The IFPI mould SID code

The second IFPI code has no L: something like IFPI 94V3 or IFPI 2U12. This is the mould SID code, and it is moulded into the plastic during injection rather than etched afterwards. Look for it on the label side, just outside the centre hole, or on the opposite side of the mirror band from the mastering code. It identifies the individual moulding machine — not just the plant, but the specific press — that formed that physical disc.

This distinction produces one of the most common points of confusion for new collectors. A single disc routinely carries a mastering code from one country and a mould code from another, because glass masters were shipped between facilities to meet demand. That is entirely normal and is often the quickest way to identify a licensed regional repress: a German mastering code with a UK mould code means a UK-manufactured disc from a German master.

Discs with no IFPI codes

If you find a matrix string but no IFPI codes anywhere, you are most likely holding a pre-1994 disc. Combine that with other era markers: a "target" label design with concentric rings points to 1983–1988; the phrase "Made in West Germany" caps the disc at 1990; a smooth-edged jewel case with no sprue marks and a fully printed booklet rather than a folded insert suggests a later manufacture. Absence of an IFPI code is evidence, not an error.

Reading the codes in practice

The etching is shallow and reflective, so technique matters. Hold the disc at roughly thirty degrees to a single bright light source and rotate it slowly; the characters flash into legibility only at a narrow angle. A phone camera with the flash off, zoomed in and focused manually, usually resolves them better than the naked eye, and gives you an image to check against database listings. Clean fingerprints off first — grease scatters the light exactly where you need it.

When transcribing, note that the IFPI prefix is sometimes separated from its code by a space and sometimes not, and that the character after L can be a zero rather than the letter O. Record what you actually see.

Searching with what you found

Start with the full matrix string. If nothing comes back, trim it: drop the trailing IFPI code, drop any single digits at the end, and search the core block or the embedded catalog number alone. Failing that, the EAN or UPC barcode on the rear inlay is the most reliable single identifier for a CD release and territory — type it with no spaces or dashes.

Once candidate releases come back, use the IFPI codes to choose between them: match the mastering code against the plant listed for each pressing, and use the mould code to confirm the country of manufacture. For the vinyl equivalent of all this, see the guide to reading runout matrix codes.

Browse more collector guides in the articles index, or run a code through the RUNOUT. matrix lookup.