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Stack of white 26-bit H10301 125 kHz proximity access control cards fanned out on a desk for a commercial system

26-Bit H10301 Explained: The Standard Prox Format and How to Order It

This guide explains what the H10301 format is, how the 26 bits are structured, what the facility code & card number mean, which readers & panels accept it, and how to order H10301 cards & fobs that drop into your existing system without reprogramming a thing. Whether you are replacing lost badges, expanding a site, or identifying what you already have, this is the reference page for the standard prox format.

by Mike Boehm on August 31, 2026

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