When you create an Instagram account, a unique identification number associated with your account is created; it is your account’s “ID card” on Instagram.
The ID is your Instagram account identification number.
Unlike your username, which you can change as many times as you want (for now), the ID always stays the same.
If you lose access to your Instagram account, it is vital that you know your ID. This number makes it possible to locate an Instagram profile if the username has been changed.
This is essential security backup information in the event of a hack.
When cybercriminals hack an Instagram profile, the first thing they do is change the username, to the victim’s despair, as they lose track of their profile—and with it all their content and their community.
How to find your Instagram account ID
It is true that few of us know this detail, but if you are hacked, you will need to know it.
To do so, go to the following link: codeofaninja.com and enter your Instagram account username. It will automatically take you to a link where it will show you a numeric code; that code is your ID.

Our advice: save this code in a secure place so you have it to hand in case you become a victim of a hack.