AWID 37-Bit Compatible Cards & Fobs
AWID's extended-capacity format: a 35-bit globally unique card number in the H10302 structure — no facility code at all — carried over AWID's 125 kHz air interface for larger fleets that outgrew 26-bit.
Does American Key Cards make AWID 37-Bit compatible cards?
Yes — American Key Cards supplies unbranded AWID 37-Bit compatible cards and key fobs (AKC AWID 37-Bit Compatible Card), encoded to your facility code and card-number range and ready to use on your existing AWID readers. No hardware changes and no dealer account required.
- 125 kHz
- Frequency
- 125 kHz prox (37-bit Wiegand, AWID air-interface encoding)
- Technology
- 1
- Bit format
- 2+
- OEM part nos.
- American Key Cards
- Order from
AWID 37-bit exists for one reason: 26-bit runs out. With only 65,535 card numbers per facility code, large or multi-site AWID deployments eventually collide with their own history, so the 37-bit structure drops the facility code entirely and dedicates 35 bits to a single unique card number — over 34 billion of them. The trade is simplicity for scale: there is no site code to manage, and every credential in the fleet is globally unique. The panel must be configured for 37-bit input, which your installer set up when the format was chosen; from then on, replacement ordering is purely a matter of continuing the card-number sequence. We program unbranded, compatible-by-specification 37-bit cards and fobs to the exact numbers you specify, verified against the H10302 bit layout before shipping, so they enroll on your AWID readers the day they arrive.
AWID 37-Bit specifications
- System brand
- AWID (Applied Wireless Identifications Group)
- Technology
- 125 kHz Passive Proximity (37-bit Wiegand, AWID air-interface encoding)
- Frequency
- 125 kHz
- Credential platform
- 125 kHz passive low-frequency transponder — same platform as AWID 26-bit with extended bit-count programming
- Bit formats
- 37-bit Wiegand (H10302-compatible) — 35-bit unique card number (0–34,359,738,367), 1 even parity bit, 1 odd parity bit; no facility-code field
- OEM part numbers
- AWID 37-bit card (ordered with 37-bit format specification), AWID 37-bit key fob
Specifications reviewed August 2026
Our compatible AWID 37-Bit credentials
American Key Cards manufactures unbranded credentials engineered to work with your existing AWID readers — no hardware changes, encoded to your facility code and card-number range before they ship.
Full specifications, form factors and ordering FAQ: Standard 125 kHz proximity cards
American Key Cards is an independent manufacturer of unbranded, compatible-by-specification credentials. We are not affiliated with, endorsed by, or sponsored by AWID, and we never supply OEM-branded product — for brand-original credentials, order from AWID or an authorized dealer. Brand names appear only to identify compatibility, and all trademarks remain the property of their respective owners.
Where AWID 37-Bit is used
- Larger AWID installations requiring more than 65,535 unique card numbers
- Enterprise and multi-site deployments where globally unique card IDs eliminate site-code management
- AWID-based parking, gated community, or commercial systems upgraded to 37-bit format
Works with these readers
Related formats
You might also need
AWID 26-Bit
A 125 kHz proximity format that outputs standard Wiegand 26-bit data — facility code 1–255, card number 1–65,535 — over AWID's own air interface, found on decades of commercial and residential installations across the U.S.
View compatible cardsHID Prox H10301 (Standard 26-Bit)
The most widely deployed proximity format in North America: 26-bit Wiegand — an 8-bit facility code plus 16-bit card number — on the 125 kHz HID Prox platform, live on millions of doors.
View compatible cardsKeri Systems PXL-250 / Keri Classic 26-bit (K-Format)
The open-standard side of the Keri world: KC-26X-class credentials in plain 26-bit H10301 Wiegand, used on PXL-250 controllers and IntelliProx installations — and readable by any standard 26-bit system.
View compatible cardsAWID 37-Bit — FAQ
What is the main advantage of AWID 37-bit over AWID 26-bit?
Capacity. 26-bit caps at 65,535 card numbers per facility code; 37-bit provides a flat space of more than 34 billion unique numbers with no facility code to manage. Large fleets choose it so card numbers never repeat across sites or reissues.
Is AWID 37-bit the same as the H10302 structure?
The data layout is H10302-compatible — 35-bit card number framed by two parity bits — but it is delivered over AWID's own air interface, so it reads on AWID readers rather than on another brand's 125 kHz readers. The panel behind the reader processes it like any 37-bit Wiegand stream.
Do I need a facility code to order AWID 37-bit cards?
No — the format has no facility-code field. You only need the card-number range to program. If you are unsure where your sequence currently stands, your access-control software's credential report shows the highest number issued.
Can my system run 26-bit and 37-bit AWID cards at the same time?
Many panels accept multiple Wiegand formats simultaneously if configured to, which is common during a migration. Check with whoever manages your panel configuration; the readers themselves pass both through. We can supply matched credentials for either format or both.