Kastle Systems Access Credentials
Managed access-as-a-service for commercial real estate — a facility guide to how Kastle administers credentials through the building account, and where standard open prox fits.
Can you buy third-party Kastle Systems Access Credentials cards?
Kastle Systems is a managed-access provider for commercial real estate: its standard credential is a building-specific proprietary 32-bit proximity format administered through the property's Kastle account, so replacements are ordered through that account (typically mykastle.com), not a card vendor. Where Kastle multi-technology readers accept standard open 26-bit proximity, American Key Cards supplies that open-format stock.
- 125 kHz
- Frequency
- Managed access-as-a-service — proprietary 125 kHz prox credential plus mobile credentials, with standard open prox support on multi-tech readers
- Technology
- 3
- Bit formats
- 1+
- OEM part nos.
- Brand channel
- Order from
Kastle works differently from most access systems because it's a managed service — the building outsources access control to Kastle, and credentials are administered through Kastle's platform rather than sourced independently. This page explains that model, why credential ordering runs through the building's Kastle account, and where standard open prox fits. We don't administer Kastle credentials; we can supply open prox where Kastle readers accept it.
The managed-access model
Kastle is access-control-as-a-service, dominant in Class A commercial office buildings across major U.S. metros. The building doesn't run its own access software — Kastle does, from its operations centers — and credentials are administered centrally through the property's Kastle account. For a tenant, that means the building's Kastle relationship, not a card catalog, is the source of credentials.
The standard Kastle credential is a proprietary 32-bit 125 kHz proximity format tied to the building's Kastle-managed facility scheme. Because it's administered through Kastle's platform and keyed to the property's account, replacements route through Kastle — typically the building's mykastle.com portal or property management — rather than an aftermarket vendor.
Kastle's credential options
Beyond the standard proximity credential, Kastle offers mobile credentials through its smartphone apps, which are increasingly the default for new tenants — the phone becomes the credential, provisioned by Kastle. And Kastle's multi-technology readers, like the AIO-A, can accept standard open proximity formats alongside the Kastle credential.
That multi-tech capability is the practical opening for independent supply: where a Kastle reader is configured to accept standard open 26-bit proximity, those are standard credentials any manufacturer can provide. But the building-specific Kastle credential itself stays within Kastle's managed platform.
Where American Key Cards fits
For the standard Kastle credential, the honest answer is that it's administered through the building's Kastle account, and that's where a tenant gets one — we won't pretend to supply a building-keyed managed credential. Where Kastle readers accept standard open 26-bit proximity, that open-format stock is something we can supply.
If you're a property manager or tenant unsure whether your Kastle readers accept open prox, that's a question for the building's Kastle account manager. Send us a photo of a working credential and we can help identify whether it's the managed Kastle credential (Kastle's channel) or an open-prox format we can supply.
Kastle Systems Access Credentials specifications
- System brand
- Kastle Systems
- Technology
- Managed access-as-a-service — proprietary 125 kHz proximity credential plus mobile credentials, with standard open prox support on multi-tech readers
- Frequency
- 125 kHz
- Credential platform
- Kastle's standard credential is a proprietary 32-bit 125 kHz proximity format administered through Kastle's managed platform; Kastle also offers mobile credentials, and multi-tech readers accept standard open 26-bit prox
- Bit formats
- Kastle proprietary 32-bit proximity (managed through Kastle's building account), Standard open 26-bit Wiegand H10301 (Kastle multi-technology readers), Kastle mobile credentials (smartphone app)
- OEM part numbers
- Kastle credentials ordered through the building's Kastle account (mykastle.com)
Specifications reviewed August 2026
How to order Kastle Systems Access Credentials credentials
Kastle is a managed-access provider: the standard Kastle credential carries a building-specific proprietary encoding administered through the property's Kastle account, so tenants order replacements through the building's Kastle account (typically at mykastle.com), not from a card vendor. Where Kastle multi-technology readers also accept standard open 26-bit proximity, American Key Cards supplies that open-format stock.
Where a Kastle multi-technology reader is configured to accept standard open 26-bit proximity, we can supply that open-format stock. The building-specific Kastle credential itself is administered through the property's Kastle account.
Editorial reference page. American Key Cards is an independent credential supplier and is not affiliated with, endorsed by, or sponsored by Kastle Systems. We do not sell Kastle Systems's secured credentials (we supply only the open, standard-format proximity credentials described above); brand and product names appear only to identify the technology discussed, and all trademarks remain the property of their respective owners.
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How it worksKastle Systems Access Credentials
Managed access-as-a-service for commercial real estate — a facility guide to how Kastle administers credentials through the building account, and where standard open prox fits.
How it worksKastle Systems Access Credentials — FAQ
Can I get a replacement Kastle card from a third party?
The standard Kastle credential is a building-specific proprietary format administered through the property's Kastle account, so replacements come through Kastle — typically mykastle.com or building management — not a card vendor. Where Kastle multi-tech readers accept standard open 26-bit proximity, we can supply that open-format stock.
What frequency and format does Kastle use?
Its standard credential is a proprietary 32-bit 125 kHz proximity format managed through the building's Kastle account. Kastle also offers mobile (smartphone) credentials, and its multi-technology readers can accept standard open 26-bit proximity in addition.
How do tenants order Kastle credentials?
Through the building's Kastle account — usually the mykastle.com portal or property management. Because Kastle is a managed service, credentials are administered centrally rather than bought from a card supplier.
Does American Key Cards work with Kastle buildings?
Only for the open-prox side, where a Kastle multi-technology reader accepts standard open 26-bit proximity — that stock we can supply. The building-specific managed Kastle credential comes through the property's Kastle account.