Datacentrex Inc. United States Stock Offering Prospectus (Version as of March 30, 2026)

Datacentrex, Inc. We are offering 4,510,000 shares of our common stock, par value $0.001 per share (the “Common Stock”), at a public offering price of$2.00 per share. We are also offering to each purchaser whose purchase of shares of our Common Stock in this offering wouldotherwise result in the purchaser, together with its affiliates and certain related parties, beneficially owning more than 4.99% (or, at theelection of the purchaser, 9.99%) of the outstanding shares of Common Stock immediately following the consummation of thisoffering, the opportunity to purchase, if the purchaser so chooses, 5,575,000 pre-funded warrants the (“Pre-Funded Warrants”) topurchase shares of Common Stock in lieu of shares of Common Stock. Each Pre-Funded Warrant will be exercisable for one share of Dominari Securities LLC (the “Placement Agent”) has agreed to act on a reasonable best-efforts basis and we acknowledge that thereis no guarantee of the successful placement of the securities, or any portion thereof, in this offering. As compensation for the servicesrendered, we will pay the Placement Agent (i) a transaction fee equal to eight percent (8.0%) of the gross proceeds of the aggregateamount of the shares of Common Stock and Pre-Funded Warrants sold in the offering payable at closing and (ii) issue to the PlacementAgent or its designees warrants to purchase shares of our Common Stock equal to eight (8.0%) of the shares of Common Stock and Our Common Stock is currently traded on The Nasdaq Capital Market under the symbol “DTCX.” On March 26, 2026, the closingsales price for our Common Stock was $3.09 per share. Investing in our securities involves risks. You should read carefully and consider “Risk Factors” included in this prospectussupplement on page S-5 and in our accompanying prospectus beginning on page 15 before investing in our securities. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of thesesecurities or determined whether this prospectus supplement or the accompanying prospectus is truthful or complete. Anyrepresentation to the contrary is a criminal offense. (1)Consists of a cash fee of 8.0% of the aggregate gross proceeds in this offering. In addition, we have agreed to pay 1.0% of theaggregate gross proceeds raised in this offering for non-accountable expenses and pay expenses of the Placement Agent’s legalcounsel in an amount of $250,000. In addition, we have agreed to issue the Placement Agent, or its designees, the Placement The Placement Agent expects to deliver the securities on or about March 30, 2026. Dominari Securities LLC The date of this prospectus supplement is March 26, 2026. TABLE OF CONTENTS PROSPECTUS SUPPLEMENT PROSPECTUS ABOUT THIS PROSPECTUS SUPPLEMENT This document is in two parts. The first part is this prospectus supplement, which describes the terms of the offering and also adds toand updates information contained in the accompanying prospectus and the documents incorporated by reference into this prospectussupplement and the accompanying prospectus. The second part consists of a prospectus, included in the registration statement on FormS-3 (File No. 333-286951). Since the accompanying prospectus provides general information about us, some of the information maynot apply to this offering. This prospectus supplement describes the specific details regarding this offering. Generally, when we refer tothe “prospectus,” we are referring to both parts of this document. Additional information is incorporated by reference in this Neither we nor the Placement Agent are making an offer to sell the securities in jurisdictions where the offer or sale is not permitted.The distribution of this prospectus supplement and the accompanying prospectus and the offer and sale of our securities in certainjurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus supplement andthe accompanying prospectus must inform themselves about and observe any restrictions relating to the offering of the securities and You should rely only on information contained in this prospectus supplement, the accompanying prospectus and thedocuments we incorporate by reference in this prospectus. We have not authorized anyone to provide you with informationthat is different from that contained in this prospectus. We are not offering to sell or seeking offers to buy shares of oursecurities in jurisdictions where offers and sales are not permitted. The information contained in this prospectus supplement Unless otherwise mentioned or unless the context requires otherwise, all references in this prospectus supplement to the “Company,”“we,” “us,” “our” and “Datacentrex” refer to Datacentrex, Inc., a Nevada corporation, and its consolidated subsidiaries. This prospectus supplement contains summaries of certain provisions contained in some of the documents described herein, butreference is made to th