How to tell whether a microchip number is valid
An ISO microchip has 15 digits and the first three give a country (001–899) or a manufacturer (900–998). We check the structure instantly and, if you have it, compare it with the passport number. A correct structure does not prove the chip is registered: for that we take you to the official register.
Analysis of the data you enteredFreeUpdated on 16.09.2026
Part of this check will come after the legal review: Official microchip search.
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What you type stays in this page’s memory: it is not stored, not put in the web address and not sent to analytics.
What it checks
- That it has 15 digits, as ISO 11784 sets out.
- Whether the prefix is a country or a manufacturer code, and which country or which manufacturer according to the ICAR registry.
- Whether it matches the number in the passport.
What it does not check
- Whether the chip exists and is registered, or which animal it belongs to: only the official register answers that, and we give you the link.
- Who the registered keeper is.
- Whether the chip is implanted or only written on paper.
How to read a microchip number
- Count the digits: if there are not 15, it is not an ISO number.
- Look at the first three: 724 is Spain, 276 Germany, 250 France. 900 to 998 is a manufacturer code: we tell you which one according to the ICAR registry.
- Search the number in the official register (in Spain, REIAC): that is what tells you whether the chip is registered.
- Ask the vet to read the chip and compare that number with the passport.
Frequently asked questions
Can you tell me whose chip this is?
No. Official registers answer that on their own sites. We give you the link and send your number nowhere.
My chip does not have 15 digits — is it wrong?
Not necessarily: some systems predate the ISO standard. Ask the vet which type of chip the animal has.
Is the number I type stored?
No. It is used for the check and discarded. It is not put in the web address or sent to analytics.