22 CFR § 213.16
Use and disclosure of mailing addresses
November 19, 2020
(a) When attempting to locate a debtor in order to collect or compromise a debt, the CFO may obtain a debtor's current mailing address from the Internal Revenue Service.
(b) Addresses obtained from the Internal Revenue Service will be used by the Agency, its officers, employees, agents or contractors and other Federal agencies only to collect or dispose of debts, and may be disclosed to other agencies and to collection agencies only for collection purposes.