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                                                                    EXHIBIT 23.2
 
                        CONSENT OF INDEPENDENT AUDITORS
 
    We consent to the reference to our firm under the caption "Experts" in the
Registration Statement on Form S-4 and the related Prospectus of IDT Corporation
("the Company") for the registration of $100,000,000 8 3/4% Senior Notes due
2006 and to the incorporation by reference therein of our report dated April 28,
1998, with respect to the financial statements of InterExchange, Inc. and
Combined Affiliates as of December 31, 1997, 1996, and 1995, and for three years
then ended, which is included in the Form 8-K/A filed by the Company on May 26,
1998.
 
                                          /s/ Amper, Politziner & Mattia P.A.
                                          --------------------------------------
                                          Amper, Politziner & Mattia P.A.
 
June 8, 1998
Edison, New Jersey
