As filed with the Securities and Exchange Commission on February 13, 2026

Registration No. 333-290594

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1

TO

FORM S-8

REGISTRATION STATEMENT NO. 333-290594

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

IDT CORPORATION

(Exact name of registrant as specified in its charter)

520 Broad Street

Newark, New Jersey 07102

(973) 438-1000

(Address of Principal Executive Offices)

IDT Corporation 2024 Equity Incentive Plan, As Amended and Restated

(Full Title of the Plan)

Shmuel Jonas

Chief Executive Officer

IDT Corporation

520 Broad Street

Newark, New Jersey 07102

(973) 438-1000

(Name, Address and Telephone Number of Agent for Service)

Copies to:

Joyce J. Mason, Esq.

General Counsel

IDT Corporation

520 Broad Street

Newark, New Jersey 07102

(973) 438-1000

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

EXPLANATORY NOTE

This Post-Effective Amendment No. 1 (this “Amendment”) to the Registration Statement on Form S-8 of IDT Corporation (File No. 333-290594) (the “Registration Statement”) is being filed as an exhibit-only filing to file the updated opinion of Joyce Mason, Esq. and consent for Joyce Mason, Esq. (included in the opinion in Exhibit 5.1), filed herewith as Exhibit 5.1. Accordingly, this Amendment consists only of the facing page, this explanatory note, the signature pages to this Amendment, the opinion filed herewith as Exhibit 5.1 and the consent filed herewith as Exhibit 23.1. The prospectus and the balance of Part II of the Registration Statement are unchanged and have been omitted. No additional securities are being registered by this Amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Amendment No. 1 to registration statement and has duly caused this Amendment No. 1 to registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Newark, State of New Jersey, on February 13, 2026.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Amendment No. 1 to registration statement has been signed by the following persons in the capacities indicated and on the date indicated.

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