I just purchased a DJI MINI 4K and I would like to know where I can find my RID number so I can enter it into the FAA.

DJI MINI 4K doesn't have remote ID as it's under 250g.  

I didn't know that, thank you very much

The Mini 4 Pro is RemoteID compliant and is needed if flying other than for recreational purposes.

To find the Remote ID code on your DJI Mini 4 drone, open the DJI Fly app, go to the flight screen, tap the three dots in the upper right corner, navigate to "Safety," then scroll down to "Remote ID".  

Hope this helps.   

Hi there, thank you for reaching out. Kindly take note that this drone is not provided with the RID function. To fly with compliance, you can fly within FRIAs or acquire a third-party RID module on the FAA DOC audit list and then retrofit it to your drone.

Thank you for your understanding and support.