For HF few standards have to be considered. ISO/IEC 18000-3 defines three HF RFID systems as Modes 1, 2 and 3. Mode 1 is based on ISO/IEC 15693 and common in use. Mode 2 is far less important and rarely used. Mode 3 is based on the memory and command structures of ISO/IEC 18000-63. Further, the standard ISO/IEC 14443 is prevalently in use for identification cards. NFC transponders are transponders using the ISO/IEC 14443 (type 1, 2 and 4 tags) standard or the ISO/IEC 15693 standard (type 5 tags). NFC tags can be accessed with the same commands as ISO/IEC 14443 tags.

Commands and memory structures follow the above described standards ISO/IEC 18000-2 for LF tags.

This standard copies the commands and memory structure of the UHF standards ISO/IEC 18000-63. The HF standard is less complex as the UHF standards. For example, ISO/IEC 18000-3 Mode 3 defines only a subset of 5 error codes compared to 14 error codes defined in ISO/IEC 18000-63.

All definitions from B.3 apply.

Memory structure may be reduced compared to ISO/IEC 18000-63. Reserved memory (MB 00) may be absent, when no passwords are needed. UII memory (MB 01) may be as small as 32 bits. Maximum size is 464 bits. TID memory (MB 10) has at least an 8-bit ISO/IEC 15963 allocation class identifier and further identifying information for unique identification. User memory (MB 11) is optional. For the operation of the tag it is the same memory structure as ISO/IEC 18000-63.

This standard defines an UID of 4, 7 or 10 bytes (ISO/IEC 14443-3). Further memory structures are not defined in parts 1 to 4. UID shall be accessed as Region 2.

Again, this standard is similar to the LF standard above and the same commands shall be used.