How do I identify an unknown device connected to my Apple Account?

Read this document if you think your Apple Account has been compromised. --> If you think your Apple Account has been compromised - Apple Support

For iOS 15 or earlier, if you want to see if anyone else has access to your device or accounts, click here --> Checklist 1: Limit device and account access - Apple Support

For iOS 16 or later see how Safety Check on iPhone works to keep you safe. Safety Check for an iPhone with iOS 16 or later - Apple Support

Use the information in this document to check your Apple ID device list to find where you're signed in --> Check your Apple Account device list to find where you’re signed in - Apple Support

Related materials:

Personal Safety User Guide

Personal Safety User Guide - Apple Support

> open the Table of Contents and review the articles

A document with general information about security and your Apple ID --> Security and your Apple Account - Apple Support

Contact Apple for help with Apple ID account security. This page provides country-specific Apple Support contact information ➞ Contact Apple Support - Apple Support

Those “unknown device” entries in Google usually just mean Google couldn’t pull a proper model name from the iOS Account Manager login, not that someone else is actually on your Apple ID. iPhones sometimes show up that way if you signed in through Safari but there's no way to identify the model.

If they’re all marked as signed out and you don’t see any weird activity in your Gmail or Google security page, it’s probably just old sessions sticking around.