Encoding & Access
37-bit H10304
A higher-capacity HID Wiegand format with a 16-bit facility code and a 19-bit card number.
H10304 is the HID format to reach for when 26-bit runs out of room: a 16-bit facility code (up to 65,535) and a 19-bit card number (up to 524,287), far more unique credentials than 26-bit H10301 allows. Unlike the open H10301, it's an HID-controlled format.
When a site outgrows 26-bit, H10304 is the common next step: a 16-bit facility code and a 19-bit card number push the ceiling to over half a million credentials. It is an HID format rather than an open one, so confirm your readers support it before ordering, and give us the facility code and starting number and we will program it.
Where this leads
If you are working this out for a live card program, start with have the cards encoded before they ship.
Related terms
Questions about 37-bit H10304?
Our team explains the jargon and specs the right gear, since 1984.