Tool

The resolver.

This is the real one, not a mock-up of one. It verifies the check digit, pulls the GS1 company prefix and carries the licensee up to whatever is listed above it — 56 prefixes, 32 parents, entirely in your browser.

Point it at something.

Or type the number printed under the bars. Both run the same lookup, on this device — nothing is uploaded and no code is recorded.

Or try one of these

Awaiting a code

Every code carries the name of the company that printed it.

The check digit is verified first, then the company prefix is matched against the map, then the licensee is carried up to its listed parent. If any of those fail you will be told which one — an unknown prefix is reported as unknown, not guessed at.