The ECID is a 64-bit hexadecimal number burned into the ARM processor of every iOS device. It is unique to the chip. Extractors often target the ECID to build custom firmware signatures, though modern security (like APTicket and nonce entanglement) has made this highly advanced.
Apple is actively fighting against hardware-level extraction. With the introduction of in Macs and the A17 Pro security features, reading identifiers is becoming exponentially harder. extractor id apple
If you search for "extractor id apple software," you will find a mix of legitimate diagnostic tools and gray-market utilities. Here are the most respected (and controversial) options used in the industry today. The ECID is a 64-bit hexadecimal number burned