Protocol scope and method
This tool checks the common 20-digit shape and displays segments without claiming that administrative or industry codes are assigned correctly.
valid shape = exactly 20 decimal digits.
Common questions
Does the GB/T 28181 Device ID Structure Check leave my browser?
No application upload is used. Avoid putting sensitive production data in shareable URLs.
Is this a standards compliance test?
No. Confirm the edition and vendor profile with licensed documents and your target platform.
Offline diagnostic aid. Verify fields, version and vendor extensions before production use.