ISRC / Catalog Number

These are two distinct identifiers used to track music releases. They operate on different layers of the music industry and are easy to confuse, but solve different problems: an ISRC identifies a specific <em>recording</em> uniquely across the entire global music ecosystem, while a catalog number identifies a specific <em>release</em> uniquely within the scope of a single label's discography. Producers and DJs cite both regularly when discussing or licensing tracks, and both are visible on Beatport pages, Discogs entries, and the artwork of physical releases. An ISRC (International Standard Recording Code) is the global per-recording 12-character identifier defined by ISO 3901 (first published in 1986, current edition ISO 3901:2019). The format is CC-XXX-YY-NNNNN: a 2-character ISO 3166-1 country code identifying the registrant's national agency, a 3-character alphanumeric registrant code, the last 2 digits of the year the ISRC was assigned, and a 5-digit serial that is unique within that registrant and year. Worked example: USUAN1400011 was issued in the United States (US), to registrant UAN, in 2014, as serial 00011 — the recording is Kevin MacLeod's "Monkeys Spinning Monkeys." ISO designated the IFPI as the global registration authority in 1989, and the IFPI in turn has delegated allocation to dozens of national agencies that issue ISRCs to record labels and individual producers. The code is mandatory for distribution to streaming platforms (Spotify, Apple Music, Beatport) and is what underpins royalty collection — every distinct recording (original mix, radio edit, dub mix, remix, instrumental, extended) gets its own ISRC, and the same recording carries the same ISRC across every release it appears on. A catalog number, by contrast, is a label-specific identifier — a code the label uses to keep its own discography sequentially numbered for inventory, distribution, and historical reference. Conventions vary by label but the general pattern is alphanumeric: a short letter prefix derived from the label name, sometimes a format indicator (CD, LP, DIGI), and a sequential number that increments with each release. Trance examples include Armada's ARMA1583, Anjunabeats' ANJ708, Black Hole's BHCD27, and Trust In Trance Records' T.I.T. CD 017 (clearly readable as the 17th release in the label's CD series). Discogs treats catalog numbers as required metadata for every label entry on a release. The two identifiers serve complementary functions and exist side by side on most releases. A given trance EP might carry a single catalog number (e.g., ANJ708) describing the EP itself, while each of its four tracks — the original, the radio edit, and two remixes — carries its own distinct ISRC. When DJs and labels discuss a track for promo licensing or compilation inclusion they generally cite both. The catalog number is the conversational shorthand inside scene communication; the ISRC is what platforms and royalty agencies look at when money actually moves. Both also intersect with the <a href="/glossary/white-label">white-label</a> tradition (test pressings often shipped with provisional or absent catalog numbers) and with the <a href="/glossary/beatport">Beatport</a> and <a href="/glossary/mix-compilation">mix-compilation</a> infrastructure that depends on them.