Encoding & Access
26-bit H10301
The most common open proximity card format: an 8-bit facility code plus a 16-bit card number.
H10301 is an industry-standard open format supported by most access systems, which is why it is so widely used.
H10301 is the open, non-proprietary format most access systems understand, an 8-bit facility code (0 to 255) plus a 16-bit card number (up to 65,535). Its openness is a strength for compatibility and a weakness for security, since numbers can repeat across sites.
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Related terms
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