Inspect identifiers
Inspect and verify a 51Degrees identifier, a cryptographically signed binary identifier.
Paste a 51Did below, in either base64 alphabet, to parse its structure, decode the payload, and verify the ECDSA P-256 signature against the signing keys 51Degrees publishes, including earlier ones. Where this site is set up for it, the page also asks 51Degrees whether your browser is the one the 51Did was created for.
Probabilistic type Random type Hashed Email type Made on another device Invalid signature Invalid structure Garbage input
The first three are created in your own browser as this page loads, so they carry today's date and describe the device you are reading on. Made on another device is different: our server asked for it while claiming an iPhone on a network in the United States, because a browser can only ever be issued an identifier for itself. Inspect that one and the factor check below reports the device, platform and browser as differing, which is the creator context doing its job.