Assign and check every ISBN
Verify ISBN ownership and imprint
Confirm which company each ISBN (International Standard Book Number) is registered to and under which imprint, because that registration decides who the world sees as the publisher.
Authors often hire help with this: metadata or distribution.
Why it matters
The ISBN registrant controls the metadata record at the source and is the name libraries and retailers file the book under. Authors who discover late that a hybrid publisher or a platform owns their ISBNs often find they cannot move the book without new numbers and new listings. Verifying early costs an email; discovering it late costs a relaunch.
Your part
- What you do
- Verify. Someone else may do it. Inspect the result yourself.
- Who normally owns it
- Publisher. Publisher owns the registration; self-publisher owns it directly; author verifies
- When
- As soon as each ISBN is assigned, and before any metadata is sent out under it (Assign and check every ISBN: twelve to six months before publication, before any listing goes live)Checked September 13, 2026 (opens in a new tab)
Your part changes with your publishing route.
How to do it
The full walkthrough
An International Standard Book Number (ISBN) is registered to a publisher when it is bought from the national ISBN agency (in the United States, Bowker, through isbn.org (opens in a new tab) and MyIdentifiers). The registrant is the publisher of record for that product. The imprint is the brand name the publisher attaches to the number, and it is what appears as the publisher name in most retail and library records.
Ask which imprint each ISBN is registered under, and who the registrant is. At a publisher the numbers come from the company's own block with an imprint name attached, and verifying is a single email: does the imprint match what you were told about the book? On a hybrid contract this is the item to take seriously, because some presses register ISBNs to themselves, some buy them in your name, and some use platform-supplied numbers, and each choice affects who controls the listing and what happens if you part ways. If you buy your own numbers, you register your own imprint name; if you use a platform's free ISBN, the platform is the registrant and its name may appear as the publisher, which is fine as long as you know it and chose it.
Record the registrant and imprint for each ISBN in the Book Identity Sheet.
If your publisher assigned the ISBN, the link above is background only: the publisher's account at the ISBN agency holds the record, and you will not use the agency's site directly.
Common mistakes
- Assuming a hybrid publisher's ISBN is yours because you paid for the package.
- Using a platform's free ISBN on one format and your own on another, so the same book shows two different publishers.
- Recording the company name when the imprint name is what appears in records, or the reverse.
- Not checking that the imprint registered at the ISBN agency matches the imprint printed on the book.
Identifiers for Verify ISBN ownership and imprint
Set a status on any record and it joins this step. All book identifiers.
| My status | Identifier | Why this matters | Yours |
|---|---|---|---|
| ISBN The International Standard Book Number, printed above the barcode. Most formats sold through the book trade get their own. | Every retailer, wholesaler, and library orders and lists your book by this number, and the title, contributors, format, price, and publication date attached to it are what those systems display, so one wrong detail shows up in many places at once. Traditionally and hybrid published authors normally receive the numbers from the publisher and check what is attached to each one. If you publish the book yourself, you buy the numbers and assign them, and you are the one who decides whether your imprint or a platform is recorded as the publisher. Keep one list of every ISBN beside the edition and format it identifies so you can check listings against it. | Add your ISBN-13 | |
| Bowker MyIdentifiers The online store where United States publishers and self-publishers buy International Standard Book Numbers (ISBNs) and manage their title records. | The publisher name attached to an ISBN prefix is set when the block is bought and follows every number in that block, so it is the name recorded as your book's publisher of record. If your publisher bought the ISBNs, that account is theirs; normally you ask for each number and check that the publisher of record is the imprint you expect and that the title details are right. If you bought your own, the record is yours to keep correct, and accepting a free platform-supplied number instead lists the platform as the publisher. Record each number beside its format and confirm that the publisher name, price, and publication date match the finished book. | Nothing to record |
What done looks like
- Each ISBN listed with its registrant (the company that bought it) and the imprint name attached to it.
- For hybrid and self-published books, written confirmation of who owns the ISBN and what happens to it if the relationship ends.
- The imprint name matching what appears on the copyright page and in retail listings.
- Any platform-supplied ISBN clearly marked as such.
Evidence. Done means someone says the work happened. Verified means you checked the confirmation, link, or public record yourself.
Ask your publisher
Copy this into an email. Replace the bracketed parts with your details.
Sources and last checked
- Official source
- Official source (opens in a new tab)
- Last checked
- September 13, 2026
- How confident we are
- Verified
Rules and deadlines change. We last checked this information on September 13, 2026. If you see something that needs updating, please tell us.