checkappleid

2023年9月26日—FromtheDevicessectionofyourAppleIDaccountpage,youcanfindallofthedevicesthatyou'recurrentlysignedintowithyourAppleID, ...,,2023年10月2日—OtherwaystofindyourAppleID·Checkifyou'vesignedintotheAppStore,FaceTimeorMessagesonyouriPhone,iPadorMac,orcheckifyou' ...

參考資訊如下
Check your Apple ID device list to find where you're signed in

2023年9月26日 — From the Devices section of your Apple ID account page, you can find all of the devices that you're currently signed in to with your Apple ID, ...

If you forgot your Apple ID

If you've forgotten your Apple ID

2023年10月2日 — Other ways to find your Apple ID · Check if you've signed in to the App Store, FaceTime or Messages on your iPhone, iPad or Mac, or check if you' ...