Exhibit 32.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of Globix Corporation (the "Company") on Form 10-Q for the period ending June 30, 2003 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Peter K. Stevenson, Chief Executive Officer of the Company, certify, pursuant to U.S.C. 'SS' 1350, as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, that: (1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of June 30, 2003 (the last date of the period covered by the Report). /s/ Peter K. Stevenson - ------------------------------ Peter K. Stevenson Chief Executive Officer Date: August 20, 2003