You can request a tax transcript to see what address the IRS has on file for you. Generally the IRS will have the address of your last tax return on file unless you changed it after you filed in 2019 for the stimulus payments or filed a change of address form.
A transcript shows most line items including the adjusted gross income (AGI) from your original Form 1040. It doesn't show changes made after you filed your original return. This transcript is only available for the current tax year and returns processed during the prior three years.
You can obtain an IRS transcript at Welcome to Get Transcript.
You can also make an appointment and visit your local IRS office.