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<PAGE> EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this registration statement on Form S-8 of our reports dated April 5, 2000 included in Vastera Inc.'s Form S-1 and Form S-1/A. /s/ ARTHUR ANDERSEN LLP ARTHUR ANDERSEN LLP Vienna, Virginia September 26, 2000
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