Exhibit 5.1

                    [Letterhead of Roberts, Sheridan & Kotel]

                                                December 21, 1999

MonsterDaata.com, Inc.
115 Stevens Avenue
Valhalla, NY 10595

                             MonsterDaata.com, Inc.
                            Registration on Form SB-2

Dear Sirs:

            We have acted as counsel for MonsterDaata.com, Inc., a Delaware
corporation (the "Issuer"), in connection with the preparation of a registration
statement on Form SB-2 (the "Registration Statement") filed with the Securities
and Exchange Commission (the "Commission") on December 21, 1999, Registration
Number 333-93511, under the Securities Act of 1933 (the "Act") for the
registration under the Act of the following securities of the Issuer:

      (i)   2,000 shares of currently outstanding common stock, par value $.01
            per share ("Common Stock");

      (ii)  692,570 shares of Common Stock issuable upon conversion of shares of
            Series A Cumulative Convertible Preferred Stock, par value of $.01
            per share (the "Series A Preferred Stock"); and

      (iii) 349,275 shares of Common Stock issuable upon the exercise of certain
            warrants to purchase Common Stock (the "Warrants").

            In that connection, we have examined originals or copies, certified
or otherwise identified to our satisfaction, of certificates of public officials
and corporate records, instruments and documents of or affecting the Issuer,
including (i) the Certificate of Incorporation of the Issuer, as amended to
date; (ii) the Bylaws of the Issuer, as amended to date; (iii) resolutions
adopted by the Board of Directors of the Issuer; (iv) the Certificate of
Designations for the Series A Preferred Stock filed with the Secretary of State
of the State of Delaware on October 22, 1999 (the "Certificate"); (v) a form of
specimen stock certificate for the Common Stock; (vi) a form of specimen stock
certificate for the Series A Preferred Stock; (vii) forms of the Warrants and
(viii) execution copies of the purchase agreements for the Series A Preferred
Stock included in the Registration Statement.


            In rendering our opinion, we have relied, as to matters of fact,
upon representations and warranties of the Issuer and upon such certificates and
other instruments of officers of the Issuer and public officials as we have
deemed necessary or appropriate for the purpose of rendering this opinion, in
each case without independent investigation or verification. Additionally,
without any independent investigation or verification, we have assumed (i) the
genuineness of all signatures, (ii) the authenticity of all documents submitted
to us as originals and the conformity with the original documents of all
documents submitted to us as certified, conformed or photostatic copies, (iii)
the authority of all persons signing any document other than the officers of the
Issuer, where applicable, signing in their capacity as such, (iv) the
enforceability of all the agreements and instruments we have reviewed in
accordance with their respective terms against the parties thereto, and (v) the
truth and accuracy of all matters of fact set forth in all agreements,
certificates and other instruments furnished to us.

            Based upon the foregoing, and subject to the limitations,
qualifications and assumptions set forth herein, we are of the opinion that:

            1. The 2,000 currently outstanding shares of Common Stock which have
been included for resale under the Registration Statement are validly issued,
fully paid and nonassessable shares.

            2. Up to 692,570 shares of Common Stock issuable upon conversion of
the Series A Preferred Stock have been duly authorized for issuance, and when
issued upon conversion by the holders of the Series A Preferred Stock in
accordance with the provisions set forth in the Certificate such shares of
Common Stock will be validly issued, fully paid and nonassessable.

            3. Up to 349,275 shares of Common Stock issuable upon exercise of
the Warrants have been duly authorized for issuance, and when issued upon
exercise of the Warrants by the holders in accordance with the terms set forth
therein (including the provisions regarding payment of the applicable exercise
price by the holders or the use of the cashless exercise provisions contained
therein) such shares of Common Stock will be validly issued, fully paid and
nonassessable.

            Members of this Firm are admitted to practice law only in the State
of New York and do not purport to be experts on, and are not expressing any
opinion with respect to, any laws other than the laws of the State of New York,
the General Corporation Law of the State of Delaware and the Federal laws of the
United States of America. As set forth in more detail in the Registration
Statement, this Firm and certain of its employees own shares of Common Stock,
Series A Preferred Stock and Warrants.

            We hereby consent to the filing of this opinion as Exhibit 5.1 to
the Registration Statement and the reference to us under the heading "Legal
Counsel" in the Prospectus included in Part I of the Registration Statement.

                                        Very truly yours,


                                        /s/ Roberts, Sheridan & Kotel,
                                        a Professional Corporation