Skip to content 
How the compatible Inner Range SIFER 56-bit (I941747A) works
The Inner Range SIFER 56-bit (I941747A) is a dual-frequency credential operating on both 125 kHz LF and 13.56 MHz HF, so the compatible part must carry the correct data on whichever band your readers use. Its data structure is 56-bit: 24-bit site + 32-bit card, no parity (Inner Range SIFER ordering code I941747A). When you present a credential, the reader decodes that exact structure and passes it to your access-control panel as a card number it recognises.
We build the compatible Inner Range SIFER 56-bit (I941747A) by encoding the matching data structure onto a programmable T5577 / EM4305 chip. Once written, the credential presents the same bits, the same facility code, and the same card number your reader already accepts. That is what "compatible by specification" means: not a generic look-alike, but a credential engineered for the exact format your system expects, matched to your facility code and card-number range.
To order, tell us the part number or format printed on your existing Inner Range card, along with your facility code and card-number range, and our specialists confirm the encoding before anything ships. Bulk and reorder quantities are welcome — pricing is a fraction of OEM list, and every credential is verified to read on your existing equipment.
Also known as
IR56 · Inner Range 56-bit · SIFER 56-bit · I941747A · SIFER-P · SIFER-U · SIFER-C
Inner Range and all other brand and product names are trademarks of their respective owners. Security ID Systems is an independent manufacturer and supplier of compatible access-control credentials and is not affiliated with, authorized by, sponsored by, or endorsed by these companies. Brand and format names are used only to identify the systems our products are compatible with.