ISWC: when you get one, and why you can't request it

57 · 2026-09-25 · 19 min read · Español

A song gets its ISWC when a collecting society registers the work and every writer on it is identified by an IPI number — not before, and not on request. There is no form because the code is not a number handed out; it is the key to a record in one central registry, and only a Registration Agency, which is normally your PRO, can write that record. It shows up afterwards in your society’s catalogue and in the public ISWC database, and once it exists it never changes.

• An ISWC is assigned to a musical work when a Registration Agency — normally the PRO one of the writers belongs to — registers it. For a new work no separate step exists; the code is part of the registration.
• Nobody can request one, because the number is issued at a central registry together with a record of the work — its title, every creator by IPI number and role, and whether it derives from another work — and only a Registration Agency can write that record.
• A registered song does not get a code while any writer lacks an IPI number, any writer share is unknown, no writer is affiliated to that agency, or the work is lyrics only.
• The code appears in your society’s member portal, in its public repertory search and in the ISWC Network. A society’s own work number is a different number.
• A cover keeps the song’s ISWC; an arrangement, a translation or an adaptation gets its own. Two codes for one song can happen, and the agencies merge them through the society that registered the work.

When does a song get an ISWC?

A song gets an ISWC when a writer or publisher registers the work with a Registration Agency, normally the PRO a writer belongs to.

The agency that runs the system says so in the plainest sentence on its site. Asked what steps to take to obtain a code, the ISWC International Agency answers: “For new works, no steps are necessary. Works will be automatically assigned a number as part of the registration process.” A song written before you joined a society is not excluded — “for previously registered works or ‘existing’ repertoire, ISWC numbers may be assigned at any time” — and the party that assigns them is, in both cases, the agency, which in Canada is SOCAN or CMRRA and in the United States is ASCAP, BMI, SESAC and a handful of others on the agency’s own list.

The clock is the society’s, and two societies describe theirs. SOCAN: “When you register a work with SOCAN, it is first assigned a temporary code, which is replaced by the ISWC code a few weeks later and can be found in the member portal in your catalogue.” ASCAP: “When a new musical work is registered with ASCAP, we send the information about it to CISAC. Then they assign the ISWC, and it becomes part of the data attached to that work.” Upstream of both, the agency says that since its 2020 modernisation “all ISWCs are now assigned centrally” and that codes are “ready for usage within hours” — hours from the moment a complete registration reaches the registry, which is not the moment you pressed submit.

Notice what is not on that list. Not the distributor: CD Baby says it in five words, “CD Baby doesn’t assign ISWCs.” Not the release. Not the recording at all. The recording gets its code at delivery and the work gets its code at registration, and the two systems are keyed to different events, which is why a song can be streaming for months before it has a code and nothing is wrong. If no writer on the song belongs to a society yet, that is the step before this one, and it is where the IPI number comes from.

Why is there no form to request one?

Because an ISWC is not a number you are given; it is the key to a record in a central registry, and only a Registration Agency can write that record.

Look at what the record has to hold. The agency lists the minimum: at least one original title; “all creators of the work (composers, authors, arrangers, translators etc.) identified by their IP-numbers and role codes”; whether the work is derived from another and how; and one category. The number is issued “at the central registry” once an agency has processed an application, and it is the registry, not the number, that says which song this is. A code without that record identifies nothing, and a record with a creator nobody has identified cannot be written. That is the whole reason, and every rule below is a consequence of it.

The chain of custody runs one way. ISO approved the standard — ISO 15707:2022 — and appointed CISAC as the Registration Authority; CISAC appoints the Registration Agencies, and “only CISAC Members … can become an ISWC Agency”; the agencies take registrations from their members and send them up. ASCAP says the same from the bottom of the chain: “CISAC will only assign an ISWC after receiving info about the work from a PRO. You cannot request a new ISWC from CISAC directly.” Whether a creator or a publisher can allocate their own is a question the agency has already answered with a No, and the map carries the answer.

One route looks like a request and is not. A publisher can be given access to the ISWC Allocation Service and receive codes before a work reaches a society — but that access “has to be granted by the Society of which the Publisher is a member of,” in the agency’s words, and a self-releasing writer with a publishing entity is asking their society for it, not filling in a form. A service for labels, which would return a provisional code at the point of release, is announced with its terms “currently being drafted.” Every door into this system is a membership.

So the thing you were looking for does not exist, and it is not an oversight. You do not apply for one, any more than you apply for a Nobel.

What stops a registered song from getting one?

A writer without an IPI number, an unknown writer share, no writer affiliated to that agency, or a work that is lyrics only.

The first two are one rule seen from two sides. The agency allocates a code “only … when all of the creators of the work have been uniquely identified,” and the identification it accepts is the IPI Name Number and role of every creator — the condition the map states and the IPI piece explains how to satisfy. BMI writes the consequence into the guide to its own repertory search, in two sentences: “ISWC numbers are only issued when all interested parties on a work are identified by their IPI number. Works with participants who have not obtained an IPI number or works that list any unknown writer/composer interests are not eligible for ISWC numbers.” A song with a 10% share nobody can put a name to is a song with no code, however complete the other 90% is.

The third is the agency’s own membership rule: “at least one of the creators must be affiliated to the Registration Agency.” A song whose writers all belong to other societies is registered through one of theirs, not through yours. The fourth is definitional. A musical work, in the standard’s terms, is “a combination of sounds with or without accompanying text,” and the agency states the exclusion outright: “Text only (lyrics) works cannot receive an ISWC.” A lyric with no music is a literary work, and this registry does not number those.

Each blocker has its fix, and none of the fixes is on this page, because each is upstream. The missing number is the co-writer’s to get, by joining a society, and the IPI piece says where it is printed once they have. The unknown share is an argument about who wrote what, and a registry cannot settle it. The affiliation is a membership. The lyric needs a melody. What the registry cannot do is wait: the code is withheld until the record is complete, and nothing about that is negotiable at the counter.

Where does your ISWC show up once it exists?

In your society’s member portal beside the work, in the society’s public repertory search, and in the ISWC Network, the public database CISAC runs.

Your own society first. SOCAN puts it in the member portal’s catalogue, next to a number that is not it: the Work Number, which SOCAN describes as “a SOCAN-specific number, while the ISWC is shared internationally between PROs.” ASCAP says its codes are “listed in your catalog in Member Access” and also “via the public ASCAP Repertory Search.” BMI’s Songview searches by ISWC or BMI Work ID and returns only an exact match, with or without the hyphens and dots — and BMI adds a caveat worth carrying: a search by code that returns nothing “may reflect that either an ISWC is not associated with a work or that no such ISWC can be found,” so search again by title before concluding the work is missing. A search that finds the work and shows no code is telling you the work is registered and the record is not yet complete, which is the previous section.

Then the registry itself. The ISWC Network at iswcnet.cisac.org is, in The MLC’s words, “a publicly available database of ISWCs,” and it holds works “that have been, or are in the process of being, registered” with a society — searchable by code, or by title and writer to find the code. It shows the Preferred ISWC for a work and, where a second one exists, the Archived one on the work’s detail page. It is behind a terms-of-use page, it is for manual lookups only, and it is the one place a code can be checked against every society at once rather than against yours. CD Baby, asked where a code is, sends you the same way: “You can usually find ISWCs in your PRO’s public repertoire database.”

What none of these can do is settle a name. A search for a common writer name returns several people, and which of them is your co-writer is decided by a title you recognise, not by the list — the IPI piece walks that dead end and the way through it.

Does a cover, a remix, a translation or an arrangement get its own ISWC?

A cover or a remix keeps the original song’s ISWC; an arrangement, a translation, an adaptation of the lyrics, a medley or an excerpt gets its own, linked to the original in the record.

The line is the one the standard draws between a work and a recording. “The ISWC will not identify recordings, sheet music or any other type of performance associated with the musical work,” the agency says, so a new recording of the same song — yours, a cover, a remix of the same writing — is a new ISRC against the same ISWC. Which recordings count as new is the ISRC Handbook’s question and has its own table; on the work side the answer is simply that nothing about the song changed, so the song’s code does not.

Change the song and the answer flips. “Musical arrangements, adaptations of lyrics and translations must receive their own unique ISWC numbers,” and they are “usually allocated by the agency which administrates the works of the arranger and/or adapter,” with “the connection between the ‘version’ and the original work … indicated in the descriptive metadata.” The agency’s list of what can carry a code runs from an instrumental version of a work with lyrics through a medley and a pot-pourri to a single cue in a soundtrack. So a Spanish lyric over your melody is a second work with a second code that points at the first; the same song with a new drummer is the first work and the first code.

One more sentence from that page, because it is the one people get backwards. Asked whether versions that breach copyright can obtain a code, the agency answers, “Surprisingly, the answer is ‘yes’,” because unauthorised arrangements “can be identified, if only to ensure that they will be recognised at an international level as works infringing the copyrights of others.” An unauthorised arrangement gets a number like any other. The registry is not approving it; it wants to be able to find it later. The code, in the agency’s own words elsewhere, “does not confer copyright or any other status,” and whether you were allowed to arrange the song in the first place is a question the arranger piece answers and this one does not.

What if your song has two ISWCs, or shares one with another song?

Two codes for one song happens; the ISWC system marks one as the Preferred ISWC, archives the other, and since 2020 the agencies can merge them — through the society that registered the work.

The agency says so itself, in the terms of use on the front of its own database: “Due to complexities in the work registration process, in a limited number of cases, more than one ISWC may have been issued for the same musical work.” The registry then displays “the ISWC that should be used (called the Preferred ISWC)” and keeps the other as an Archived ISWC that still resolves to the work. The definition on the agency’s front page says unique and permanent. So in those cases the unique, permanent code comes as a pair, and one of the pair is the preferred one.

The 2020 modernisation is what made the pair fixable. “Multiple ISWCs can now be merged together or separated should these assignments have been done in error,” the agency says, and it solved the mirror-image defect in the same modernisation: two genuinely different songs with the same title by the same writer, which used to collapse into one record, can now be flagged by an agency “as unique works.” Both operations are the agency’s to perform, which means the door is your society — the one that registered the work, or the one your co-writer’s did. A creator with no direct relationship with any agency, the agency says, “may contact the Registration Authority for assistance,” and assistance is the word: a person at CISAC, not a form.

If the two codes are on two recordings of one song rather than on the song, that is a different registry with a different fix, and the duplicate ISRC has its own page. Check which side of the line you are on before you write to anyone: the work’s code in your society’s catalogue, the recording’s in your distributor’s dashboard.

Do you need an ISWC to get paid?

No; a society pays on its own registration, and The MLC accepts one without the code. An ISWC raises the chance that a use is matched to your registration, especially abroad.

ASCAP puts both halves in one paragraph: “While the lack of an ISWC won’t necessarily prevent you from getting paid by ASCAP if your music is performed, having an ISWC attached to a work can increase the likelihood that more performances will be captured.” The place it earns its keep is the border. When a society sends data about its members’ music to its partners abroad, ASCAP says, “they have an easier time tracking your music if the data includes ISWCs,” and it gives the reason in a phrase every co-writer will recognise: all the songwriters named John Smith. The code is what lets a society in Bogotá or Tokyo tell your song from a stranger’s without reading the title.

On the mechanical side the position is the same. The MLC describes the ISWC as “helpful when activity or information related to musical works needs to be tracked or managed, such as in the processing of public performance or mechanical royalties,” and it does not require any identifier on a registration — it recommends them. So the registration is what pays; the code is what makes the registration easier to hit. A song with a code and no registration earns nothing; a song with a registration and no code earns what the matching can find, which is less, by an amount nobody publishes.

And there is a thing the code does not carry, which matters because people write to it as if it did. The agency: the ISWC “will not indicate the shares of composers or copyright owners of the work (often there are too many owners, which can change with time, territory and rights), nor the date or place where the work was initially created or published.” The shares live on the split sheet and in each society’s registration; the ownership lives in the paperwork; the code is the label on the outside, as the map says of all four. Knowing the code of a song tells you which song. It does not tell you who is owed for it, and every stream that pays a writer is paid off a registration, not off a code.

What do you do with the code once you have it?

Write it on the split sheet, on every registration and licence that has a field for it, and in the distributor’s optional ISWC field; it never changes, whichever society you move to.

The agency wants it on paper. The code “should be printed on all correspondence pertaining to the work to which it has been allocated,” and its usage page gives the shape for a contract: “I Love Life” (Smith/Jones) (ISWC T-345246800-1). That is a sync licence, a publishing agreement, a cue sheet, a co-writing agreement — anywhere the song is named and somebody later has to be sure which song was meant. On the split sheet it goes in the line the template keeps for it, blank at the session and filled in when it arrives, which is the one edit that document expects after signing. On the distributor’s form it goes in the optional ISWC field where one exists, and leaving it blank there is a correct value, not an error.

Two things it never does. It never changes: asked what happens when creators move from one society to another, the agency answers, “Nothing happens because the ISWC is permanently assigned to the musical work.” Your membership can move, your publisher can change, the shares can be renegotiated, and the identifiers stay exactly where they were. And it never becomes a society’s work number: the ISWC “is the common numbering system that allows databases to be linked automatically,” and each society keeps its own internal number beside it. Writing a SOCAN work number or a BMI work ID into a field that asked for an ISWC is the same class of error as an account number in the IPI field, and it fails the same way — silently, at the match.

Then check the rest of the catalogue while you are there. The audit checklist’s identifier layer asks, per track, whether the ISRC, the ISWC and each writer’s IPI are recorded and agree with what the societies hold, and a catalogue where half the songs have codes and half are still on a temporary number is the usual finding.

FAQ

Can my distributor get me an ISWC?

No. A distributor assigns or passes on the ISRC for each recording and the UPC for the release; the ISWC belongs to the song and is allocated only by a Registration Agency, which is normally a PRO. CD Baby states in its own help centre that it does not assign ISWCs and that they come from your PRO. Where a recording’s code comes from, with or without a distributor, is a separate question with its own routes.

Is my SOCAN work number or BMI work ID the same as my ISWC?

No. A work number is the society’s own internal identifier for a registration and means nothing outside that society; the ISWC is the one code every society shares. SOCAN states the difference on its own page, and the ISWC Agency says the code does not replace a society’s numbering — it links the databases to each other.

Do I need the ISWC before the recording is released?

No. A delivery needs an ISRC on each recording and a UPC on the release, and where a distributor’s form has an ISWC field it is optional. The song’s code arrives when the work is registered, on the society’s clock, and a recording that is live months before its song has a code is the normal case.

Does a public-domain or traditional song have an ISWC?

It can. ISWCs are allocated regardless of copyright status, and a Registration Agency may number the traditional folk repertoire and works whose authors are unknown under its own local rules. An ISWC on a song says nothing about whether the song is protected.

Sources

• ISWC International Agency, The ISWC — the definition; the letter T, nine digits and a check digit; the minimum descriptive record (an original title, every creator by IP number and role code, derivation, category); that the code should be printed on all correspondence about the work; the 2020 modernisation — central assignment, merging and separating, identical-title flagging, codes ready within hours; that it will not identify recordings and will not indicate shares, owners or dates.
• ISWC International Agency, How to get an ISWC number? — that for new works no steps are necessary and the code is part of registration; that existing repertoire may be numbered at any time; that only Registration Agencies deliver codes; a publisher’s access to the Allocation Service through its society; allocation only once all creators are uniquely identified; assignment at the central registry; and that a creator without a direct relationship with an agency may contact the Registration Authority for assistance.
• ISWC International Agency, ISWC for Creators and Publishers — complete metadata including the Original Title and the IPI Name Numbers and Roles of all creators; at least one creator affiliated to the agency.
• ISWC International Agency, ISWC for Collective Management Organisations — the standard as ISO 15707:2022; a musical work as a combination of sounds with or without text; that only CISAC members and client entities can become an ISWC Agency; that the code does not confer copyright or any other status.
• ISWC International Agency, Which musical works can receive an ISWC? — allocation regardless of copyright status; public-domain and traditional repertoire; that text-only works cannot receive a code; that arrangements, adaptations and translations must receive their own, usually from the arranger’s or adapter’s agency, with the link to the original in the record; excerpts and medleys; and the answer on infringing arrangements.
• ISWC International Agency, ISWC usage — the written format; how the code should be used and the contract example; that nothing happens to the code when a creator changes society; that it does not replace a society’s own numbering.
• ISWC International Agency, Agencies — the list of Registration Agencies by country, including SOCAN and CMRRA for Canada and ASCAP, BMI and SESAC for the United States.
• ISWC Network, Terms of Use — that in a limited number of cases more than one ISWC may have been issued for one work; the Preferred ISWC and the Archived ISWC; that the database holds works registered or in the process of registration; lookup by code or by work; manual queries only. The search sits behind this page and was not entered for this piece.
• ASCAP, All About ISWCs and How They Can Help You Get Paid (18 November 2023) — that ASCAP sends a registered work to CISAC and the code comes back attached to the work; that a new ISWC cannot be requested from CISAC directly; that every writer needs an IPI first; that the lack of a code will not necessarily prevent payment and that a code can increase the performances captured, especially abroad; where a member’s codes are listed.
• BMI, Songview Search — User Guide — that ISWCs are issued only when every interested party is identified by an IPI number and that works with unnumbered or unknown writer interests are not eligible; search by ISWC or BMI Work ID; what a “no result” for a code can mean.
• SOCAN, Important Codes & Numbers (Words and Music) — a temporary code on registration, replaced by the ISWC a few weeks later in the member portal; the Work Number as a SOCAN-specific number and the ISWC as the one shared internationally.
• The MLC, Know Your Identifiers — the ISWC as an identifier assigned to a musical work the first time it is registered with a qualified agency, in the US by a PRO; its use in processing performance and mechanical royalties; the ISWC Network as a public database; that The MLC requires no identifier and recommends them.
• CD Baby, Understanding ISRCs — that CD Baby does not assign ISWCs, that a PRO does, and that they can usually be found in the PRO’s public repertoire database.

Every page cited here was read on the date at the top of this piece. Society pages and the agency’s own change without notice, and three publishers refused or could not be read — BMI’s FAQ, ISO’s standard page and PRS for Music’s help centre — which is why nothing here is cited to them. The ISWC Network’s search was not entered. Confirm anything operational against your own society’s pages before you act on it.

Keeping the register

Every section above ends with a number to write down somewhere it will still be next year: beside the recording it belongs to, beside the writers it belongs to, and not in the society’s portal alone. CatalogTracker keeps the ISWC on the track beside its ISRC, version and recording type, keeps each writer’s IPI and PRO on the party rather than in an email, and searches the catalogue by ISRC, ISWC, UPC, GRid, ISNI or IPI, saying which identifier matched. In development for iPhone.