How can I learn my address written on the IRS system?

[DoninGA]

The address on file with the IRS is based on the last federal tax return you filed.

Go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript

For a fee of $43 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf