Keri Systems NXT Compatible Cards & Fobs
Keri Systems NXT is a proprietary 125 kHz proximity format with encrypted card-to-reader communication used exclusively with Keri's NetXtreme reader line.
Keri NXT credentials operate at 125 kHz but employ an encrypted handshake protocol (96-bit for cards, 128-bit for fobs) rather than broadcasting a plain Wiegand data stream — making them significantly harder to clone than standard prox cards. Our NXT-compatible cards are factory-programmed to match the NXT protocol and serve as direct drop-in replacements for lost or damaged OEM credentials on Keri NetXtreme installations.
Keri Systems NXT specifications
- Brand / OEM
- Keri Systems
- Technology
- Passive RFID proximity with encrypted rolling challenge
- Frequency
- 125 kHz
- Chip
- Keri proprietary NXT IC (96-bit encrypted card-to-reader protocol; not standard Wiegand chip)
- Bit formats
- Keri NXT proprietary encrypted format (not standard 26-bit Wiegand)
- OEM part numbers
- NXT-C, NXT-I, NXT-K
Our compatible Keri Systems NXT credentials
American Key Cards manufactures non-OEM credentials engineered to work with your existing Keri Systems readers — no hardware changes, encoded to your facility code and card-number range.
Can Keri Systems NXT cards be copied?
No. Keri Systems NXT relies on secure encryption, so it cannot be cloned from an existing card. This is a security strength, not a limitation of our service.
Where Keri Systems NXT is used
- Commercial buildings using Keri NetXtreme (NXT) access control systems
- Multi-door installations with NXT-1R, NXT-3R, or NXT-5R readers
- Employee badge programs replacing lost or damaged NXT credentials
- Schools and universities with Keri NXT infrastructure
Compatible readers
Related formats
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Keri Systems PXL-250 / Keri Classic 26-bit (K-Format)
Keri Systems 26-bit (KC-26X / PSK-3) cards use the industry-standard H10301 Wiegand format, compatible with Keri IntelliProx 2000 controllers and any standard Wiegand reader.
View compatible cardsKeri Systems MS Format (MicroStar)
Keri MS (MicroStar) is a proprietary 125 kHz proximity format used exclusively with Keri MicroStar readers and PXL-500P Tiger controllers, one of the most widely deployed legacy formats in North American commercial buildings.
View compatible cardsHID 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 cardsKeri Systems NXT — FAQ
Are Keri NXT cards the same as standard 125 kHz proximity cards?
No. While NXT credentials operate at 125 kHz, they use Keri's proprietary encrypted protocol (not standard Wiegand-on-air), so generic 125 kHz cloners cannot copy them. You need credentials specifically programmed to the NXT format.
Can I use Keri NXT cards on non-Keri readers?
No — NXT credentials are only compatible with Keri NXT-series readers. If your system is being upgraded to Wiegand-based readers, you would need to switch to Keri's 26-bit (26X-series) credentials instead.
What is the difference between NXT-C and NXT-K credentials?
The NXT-C is a clamshell-style proximity card (96-bit encrypted), while the NXT-K is a key ring fob with 128-bit encryption. Both are interchangeable on the same NXT system.