Ultralight C or Classic 1K? Which chip your hotel locks need

Magnetic stripe or RFID? A quick self-check before you ask for a quote

A visible magnetic stripe is a useful clue, but a hotel key card can carry both a stripe and an RFID chip, and the absence of a stripe does not by itself prove that a chip is present. Note whether the property swipes, inserts or taps the card at the door, and look for a card part number or supplier specification. The card body alone, whether PVC, paper or wood, does not identify the credential inside.

RFID chips operate in one of three frequency bands. Hotel locks overwhelmingly use HF at 13.56 MHz, which balances memory, security, read range and cost, and the MIFARE families listed further down all sit in this band. LF at 125 kHz appears mainly in older systems. UHF offers a longer read range but is rarely used for guest-room doors; if you find a UHF card in a hotel setting, check with your lock vendor before ordering, because it is unusual.

Identifying the band narrows the search. It does not identify the chip version, capacity or credential preparation that your issuing system requires.

Reading the antenna under a bright light

Hold the card up to a bright light and look for the antenna pattern inside the plastic. Treat this as a fast first read, not a final answer:

• A large round copper coil usually indicates LF.
• A large rectangular copper coil usually indicates standard HF.
• A finer rectangular etched aluminium pattern, especially in a thin card around 0.5 mm thick or a paper-based card, also usually indicates HF.
• A long, narrow aluminium strip usually indicates UHF, which is uncommon for hotel doors.

Opaque, printed or metallic card bodies can hide the antenna. If nothing is visible, move on to a scan or ask the service provider for the specification.

What an NFC phone can and cannot read

NFC phones communicate at 13.56 MHz, so a phone with a compatible tag-reading app may report the chip family or IC type of a supported HF card. Record the result from an authorized test card and compare it with the current card part number or supplier specification.

A phone cannot read a 125 kHz LF card, a UHF card or a magnetic stripe, and some HF cards are not detected because of phone and app support, card construction or the condition of the card. A failed scan is therefore inconclusive: it does not establish the frequency band, prove that a card is faulty or explain why a card stopped working.

A chip identification result, from a phone or any other reader, does not confirm credential preparation or prove that your hotel can issue the card. Confirm the specification with the service provider and test agreed samples in the property’s normal workflow.

Three ways to collect identification evidence

• An NFC smartphone and a chip-reading app

  Quick and widely available, but limited to supported HF chips. Record the reported chip family and treat it as a clue rather than an approval.

• A dedicated RFID reader

  A reader and its software can identify cards within the frequencies and protocols they support. Confirm the reader specification before interpreting a scan result, and compare several authorized test cards. Matching chip names or UID formats are useful evidence, but they do not establish that a replacement meets your issuing system’s requirements.

• Samples sent to an RFID specialist

  A specialist can investigate an unidentified card when its specification is unavailable. Agree what the identification service covers and how samples are handled. The result still has to be checked against the installed system: have an authorized operator enroll and encode a proposed replacement, then test the intended doors and readers before approving a bulk order.

• NFC Forum: NFC technology overview (13.56 MHz)
• GS1: UHF Gen2 air interface protocol (UHF band)

Keep the complete chip name on the quote

MIFARE Ultralight EV1, Ultralight C and Ultralight AES are distinct NXP products. Do not shorten the specification to “Ultralight” or agree a substitution solely because the names look similar.

The current lock manufacturer’s credential catalogue is a useful reference, but it does not automatically describe older hardware or a particular hotel’s configuration. Ask the service provider which exact credential is approved for your installation.

For an order, confirm both the chip specification and the finished credential preparation. Those are separate from the artwork proof and the hotel’s on-site issuing process.

Five steps from identification to a purchase request

1. Collect the reader and issuing system details

   Record the lock or reader model, any retrofit, the software name and version, and encoder model. A photo of a visible model label can help; avoid including guest information.

2. Find the current card SKU or approved specification

   Check the latest accepted order or ask your authorized lock service provider for the exact chip version, capacity and credential preparation requirements. Do not send passwords, encryption keys or access data.

3. Use scans and photos as supporting clues

   A compatible phone or reader may help identify a chip family, but it does not verify every protected setting or approve a replacement credential. A failed phone scan is not proof that a card is faulty. Have the specification confirmed by the service provider.

4. Request a quote and a sample plan

   Share the non-sensitive specification, quantity, card material, artwork status and delivery destination. If you are unsure of a field, say so. Confirm sample type, any preparation, fees and timing before dispatch.

5. Approve samples in the hotel’s normal workflow

   Have an authorized operator encode and test the agreed samples on the relevant doors and shared access points. Review print and material separately, record the accepted specification, and agree bulk-order acceptance requirements.

You can start a request with incomplete information. Sample availability, fees and delivery timing are confirmed for the project. Request test samples