HID Prox H10304 (37-Bit with Facility Code) Compatible Cards & Fobs
HID H10304 is a 37-bit proximity format that mirrors the facility-code-plus-card-number structure of 26-bit but with vastly expanded ranges: 65,535 facility codes and 524,287 card numbers each.
H10304 solves the facility-code exhaustion problem of the ubiquitous 26-bit format while maintaining the familiar two-field management model that access administrators already understand. American Key Cards programs H10304-format cards and fobs to your exact specifications, ready to drop into any access control system that supports 37-bit Wiegand input.
HID Prox H10304 (37-Bit with Facility Code) specifications
- Brand / OEM
- HID Global / ASSA ABLOY
- Technology
- 125 kHz Passive Proximity
- Frequency
- 125 kHz
- Chip
- HID Prox
- Bit formats
- 37-bit Wiegand (1 parity + 16-bit facility code + 19-bit card number + 1 parity)
- OEM part numbers
- 1386, 1326, 1346, 1586
Our compatible HID Prox H10304 (37-Bit with Facility Code) credentials
American Key Cards manufactures non-OEM credentials engineered to work with your existing HID readers — no hardware changes, encoded to your facility code and card-number range.
Can HID Prox H10304 (37-Bit with Facility Code) cards be copied?
HID Prox H10304 (37-Bit with Facility Code) is an open format, so a compatible card can be produced from your facility code and card number. We don't copy individual cards on request — we manufacture new, correctly-encoded credentials for systems you own or manage.
H10304 extends the classic 26-bit layout to 37 bits, expanding facility codes to 65,535 possible values and card numbers to 524,287 per facility code. This eliminates the collision risk of 26-bit deployments while retaining the familiar facility-code-plus-card-number management model. Still vulnerable to cloning like all 125 kHz proximity formats.
Where HID Prox H10304 (37-Bit with Facility Code) is used
- Multi-site enterprise deployments needing more facility codes than 26-bit allows
- Healthcare networks
- University systems with many buildings
- Facilities migrating from 26-bit that want structured facility code management
Compatible readers
Related formats
You might also need
HID Prox H10301 (Standard 26-Bit)
The HID H10301 26-bit format is the most widely deployed proximity card format in North America, used on millions of doors across commercial and residential buildings.
View compatible cardsHID Prox H10302 (37-Bit, No Facility Code)
HID H10302 is a 37-bit proximity format with no facility code, providing over 34 billion unique card numbers for large deployments that need a flat, globally unique credential space.
View compatible cardsHID Prox H10304 (37-Bit with Facility Code) — FAQ
How many facility codes does H10304 support?
H10304 supports 65,535 unique facility codes (16-bit field), compared to only 255 for the 26-bit H10301 format. Each facility code can contain up to 524,287 individual card numbers (19-bit field).
Is H10304 backward compatible with 26-bit readers?
No. H10304 transmits 37 bits of data. Readers and panels configured for 26-bit Wiegand will either reject the credential or misinterpret the data. Your panel must be set to 37-bit Wiegand mode to read H10304 cards correctly.
Why would I choose H10304 over H10301?
If your deployment spans many sites or buildings and you have already exhausted the 255 available facility codes in the 26-bit H10301 format, H10304 gives you 65,535 facility codes — enough for virtually any enterprise. The tradeoff is ensuring all your readers and panels support 37-bit Wiegand.