You can find this 48-digit hexadecimal number directly in your device settings. Open the app. Tap on General . Select About . Scroll down to find SEID .
Many users confuse the "6-digit code" generated by the SEID menu with the SEID itself. When you tap on the SEID in the About section, iOS generates a visible 6-digit verification code. This is sometimes required during certain support sessions or app setups to ensure you are physically holding the device. seid iphone check link
If you cannot access the iPhone's screen, you can check identifiers through your Apple Account: How to Find the SEID Number on iPhone 16 Pro! You can find this 48-digit hexadecimal number directly
Websites like IMEI24, Orchid, or Sickw allow you to paste your hardware identifiers into their search bars. Select About