INCENTIVE STOCK OPTION AGREEMENT

UNDER THE

NEUSTAR, INC. 1999 EQUITY INCENTIVE PLAN

THIS AGREEMENT, made as of April 10, 2000 (the Effective Date), by and between NeuStar, Inc., a Delaware corporation (the Company), and Jeffrey Ganek (the Participant).

W I T N E S S E T H:

WHEREAS, the Company desires to afford the Participant the opportunity to acquire an ownership of the Companys common stock, par value $.002 per share (Common Stock), so that the Participant may have a direct proprietary interest in the Companys success.

NOW, THEREFORE, in consideration of the covenants and agreements herein contained, the parties hereto hereby agree as follows:

1.                                       Grant of Option.  Subject to the terms and conditions set forth herein and in the Companys 1999 Equity Incentive Plan, the Company hereby grants to the Participant, during the period commencing on the date of this Agreement and ending on November 30, 2009 (the Expiration Date), the right and option (the right to purchase any one share of Common Stock hereunder being an Option) to purchase from the Company 679,510 shares of Common Stock.  The Options shall have an exercise price of $0.0934 per share, which is not less than the Fair Market Value per share of the Common Stock as of the date hereof.  Each of the Options granted pursuant to this Section 1 shall constitute Incentive Common Stock Options to the extent permissible under Section 422 of the Code and the Plan.

2.                                       Limitations on Exercise of Options.  Subject to the terms and conditions set forth herein and the Plan, the Options shall vest and become exercisable, on a cumulative basis, with respect to 25% of the shares on November 30, 2000, and with respect to 2.083% of the shares on the last day of each succeeding calendar month thereafter so long as the Participant continues in the Service of the Company; provided, however, the Participant may not exercise any Option for fractional shares of Common Stock.  The Committee or the Board may accelerate the vesting and exercisability of any or all of the then-unvested Options at any time.

3.                                       Termination of Service.  (a) If, prior to the Expiration Date, the Participants Service with the Company shall terminate (the date of termination being the Date of Termination) by reason of a Normal Termination (as defined in the Plan), the Options shall remain exercisable until the earlier of the Expiration Date or the day three (3) months after the Date of Termination to the extent the Options were vested and exercisable as of the Date of Termination.

(b) If the Participants Service with the Company shall cease prior to the Expiration Date by reason of death or disability, or the Participant shall die or become disabled while entitled to exercise any of the Options pursuant to paragraph 3(a), the Participant or the Participants legal representative, or, in the case of death, the executor