N.J. Stat. § 2A:17-56.54
For the purposes of enforcing a support provision in an order or judgment, procedural due process requirements may be deemed to have been met with respect to the party upon delivery of written notice to that party's most recent residential or employer address on file with the department, if there is a sufficient showing that diligent efforts have been made to locate the party by making inquiries that may include, but are not limited to, the United States Postal Service, Division of Motor Vehicles in the Department of Transportation, the Department of Labor, the Division of Taxation in the Department of the Treasury and the Department of Corrections. A certification documenting unsuccessful efforts to locate a party shall be provided to the court before any adverse action is taken based on failure of the party to respond to a notice. For the purposes of establishing or modifying the child support provision of a court order or judgment, service of process shall be consistent with court rules or applicable statutes.
N.J.S. § 2A:17-56.54