FAQ

Is ACN free?

Yes. Anyone can search the catalog and use ACN numbers, with no account needed.

How do I cite a card?

Write "ACN" followed by the number, for example ACN ATC.1909.T206.1005. Use the Copy button next to the number to copy the citation exactly.

Can I search without knowing the number?

Yes. Type a player, team or description and ACN will find matching cards. You can also enter an exact ACN number, a set code like T206, or a year to jump straight to that page.

What does ACN cover?

Baseball cards from 1886 through 2025: over 1.16M cards in 19,689 sets from 454 publishers.

Is every set listed card by card?

Yes. Every set in the catalog has its cards listed, each with its own ACN number. If a card you know of is missing from a set, report it on the Corrections page.

Why are some sets filed under UNK?

UNK stands for unknown. It is used when the publisher of a set hasn't been confirmed. The set still gets numbers, and if the publisher is identified later, a note is added to the record.

Where does the data come from?

ACN draws on long-standing collector references, published checklists, and the hobby's standard set catalog. Coverage is uneven: some years and sets are listed in far more detail than others, and the catalog is updated as gaps are filled.

I found a mistake. How do I report it?

Open an issue on GitHub issues. Please include the ACN number and what should change.

Will a correction change a card's number?

No. Numbers are permanent. A fix is added as a note on the record, so existing citations keep working.

Does ACN show prices or grades?

No. ACN is a catalog, not a marketplace. It only identifies cards.

Do I need an account?

No. ACN has no accounts, sign-ups or logins. Just search and browse.

Can I use ACN numbers in my own listings, books or spreadsheets?

Yes, and please do. That's what they're for. See Terms and use of data for the details.