Limited encoding options for this format. Facility Code = 249 only.  Number Range Available:  120,001 thru 524,287. Multiple encoding options available in our RapidPROX® line. Click on the lady above!

The HID ProxCard II Clamshell Card programmed in H10304 37-bit format with facility code 249 is designed for access control systems that require a predefined, fixed facility code combined with an expanded card number range. Unlike open formats where facility codes can be broadly assigned, the H10304 format uses a specific, designated facility code (249), ensuring consistent credential structure and compatibility within systems configured for this exact format. This makes it critical that replacement or expansion cards match both the bit format and facility code to function properly.

The 37-bit structure provides a significantly larger card number capacity compared to standard 26-bit formats, allowing for a broader range of unique credentials within the same facility code. This is especially beneficial for organizations with growing user populations or environments that require long-term scalability. By combining a fixed facility code with an expanded numbering range, the H10304 format offers a balance of structure, organization, and increased capacity. Operating on reliable 125 kHz proximity technology, these clamshell cards deliver consistent, contactless performance and are built for durability in high-use commercial, institutional, and industrial environments.