How To Duplicate a RFID Key Fob

RFID DIY • Property Managers • Tech-Savvy

How to Duplicate an RFID Key Fob

Copy RFID fobs and access cards the right way. Understand types & frequencies, which tools work, legal notes, and what to try if your fob is encrypted.

Quick links

What is an RFID Key Fob?

An RFID key fob is a small access device (tag, fob, or card) that unlocks a reader when held nearby. It contains a chip that broadcasts an ID the reader recognizes. For a deeper primer, see RFID Key Fob Explained.

Before duplicating: identify your fob’s brand and frequency. Condos/HOA pools commonly use low-frequency (LF) fobs like HID Prox, ioProx, AWID. Many newer apartments use dual-frequency fobs (e.g., Schlage 9691T) — LF for amenities/exterior doors and high-frequency (HF) for higher-security doors (your unit). Some properties use UHF windshield tags for garages; others use garage remotes with an RFID chip (e.g., Monarch, ioProx).

RFID Types & Typical Uses

  • LF 125 kHz: Amenities, gates, older systems (HID Prox, AWID, ioProx).
  • HF 13.56 MHz: Newer + often encrypted (MIFARE Classic/DESFire, HID iCLASS, NFC).
  • Dual-Frequency (LF+HF): One fob, two chips (e.g., Schlage 9691T).
  • UHF (~900 MHz): Long-range windshield tags for garage gates.
  • RFID-Enabled Garage Remotes: Clickers that also act as proximity fobs.

Comparison: Fob Types, Frequencies & Cloning Methods

Fob Type & Frequency Common Uses & Brands Recommended Duplication Method
Low-Frequency (LF) 125 kHz
Usually Unencrypted 		Condos, HOA pools, exterior doors. Brands: HID ProxKey, AWID, Kantech ioProx, Indala. Handheld 125 kHz copier that can read/write T5577-type blanks. Quick DIY for most legacy systems.
High-Frequency (HF) 13.56 MHz
Often Encrypted 		Apartment unit doors, offices, smart cards. Tech: MIFARE Classic/DESFire, HID iCLASS, NFC. NFC encoder or advanced tools (e.g., Proxmark-class) depending on security. Some HF cards can’t be cloned without authorized gear.
Dual-Frequency (LF + HF) Multi-tech fobs (e.g., Schlage 9691T): LF for amenities, HF for high-security doors. Clone LF with a 125 kHz writer; clone HF with compatible NFC tool if security allows. May require two blanks or a dual-tech blank.
UHF (≈860–960 MHz) Long-Range Windshield/vehicle tags for garage gates. Brands: Nedap, AWID UHF, TransCore. Typically not DIY-cloneable due to anti-cloning features. Options: serial-number duplication services or request an extra tag from management.
RFID-Enabled Garage Remotes Remotes (e.g., Monarch, Linear) with a built-in LF proximity chip for readers. Identify chip frequency (often 125 kHz). Clone RFID data to a small T5577 fob/card. Remote button function is separate.

How to Duplicate an RFID Key Fob (DIY)

  1. Get a compatible copier. For LF, use a handheld 125 kHz reader/writer that supports T5577 blanks.
  2. Read the original fob. Hold it flat on the reader area; press Read. Reposition and retry if needed.
  3. Place a blank tag. Use the correct blank (T5577 for LF; proper NFC blank for HF).
  4. Write the data. Press Write to program the blank. Confirm success.
  5. Test at the door. Try the new fob at the reader. If it fails, recheck frequency/blank type and repeat.
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Tip: Modern HF/dual-tech fobs may be encrypted. If a basic copier can’t read or the clone fails, the HF portion likely needs a higher-end tool or authorized issuer.

Tools & Options

Handheld 125 kHz Cloners (LF)

Ideal for legacy LF (HID Prox, AWID, ioProx). Workflow: Read → Place Blank → Write → Test.

Smartphone + NFC Apps (HF)

Some Android apps can handle certain 13.56 MHz cards if keys are known (e.g., older MIFARE Classic). iPhone NFC generally can’t emulate building fobs; consider an NFC sticker on your case.

Advanced Tools (HF/Dual)

Proxmark-class tools can analyze/emulate many tags but require technical skill — overkill for most DIY.

Services & Kiosks

Locksmiths/kiosks can copy many LF fobs quickly; complex HF or UHF may need specialized services or property-manager support.

Prefer “clone-from-home” convenience?
Explore supported fobs, cards, and UHF tags.

Security & Legal

Only duplicate fobs that you own and are authorized to copy. Unauthorized duplication may violate building rules or local laws. When in doubt, ask your property manager.

FAQ

Is it legal to duplicate a key fob?

Duplicating your own fob for personal use is generally permitted, but copying someone else’s or bypassing building policy is not. Always verify your building’s rules.

How much does it cost?

DIY: copier ($10–$30 for LF) + blanks ($1–$5 each). Professional services vary; encrypted HF/UHF usually cost more.

Can I copy my fob to my phone?

Direct emulation isn’t generally supported. A common workaround is programming an NFC sticker and attaching it to your phone case.

Can I clone both parts of a dual-frequency fob?

Often yes for LF; HF depends on encryption. You may need two blanks (LF + HF) or a dual-tech blank and a compatible encoder.

What about UHF windshield tags?

Many UHF tags have anti-cloning features. Ask management for an extra tag or check if a serial-number duplication service supports your tag type.

Related Guides & Products

Need help identifying your fob?

Send a clear photo of your fob (front/back) and any printed numbers. We’ll help confirm the frequency and best duplication path.

Contact: support@sumokey.com