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Exhibit 10.3.3
 (FCC LOGO)
    
    Federal Communications CommissionWashington, D.C. 20554
  
  Re:
    
    Notification of Intent to Exercise Option & Notification of Exercising of Option Contract No. CON01000016
    Sincerely,-s- Anthony S. WimbushAnthony S. WimbushContracting Officer




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AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE IPAGE            OF            PAGES 2. AMENDMENT/MODIFICAITON NO. 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicble) 0031 6. ISSUED BY            CODE FCC/Contracts and Purchasing Center 445 12th Street., SW Washington, DC 20554 07/10/07  7. ADMINISTERED BY (If other than Item 6) CODE 8. NAME AND ADDRESS OF CONTRACTOR (No., street, county. State and ZIP Code) Neustar, Inc. 4600 Center Oak Plaza Sterling, VA 20166 CODE FACILITY CODE (X) 9A. AMENDMENT OF SOLICIATION NO. |9B. DATED (SEE ITEM 11) 10A. MODIFICATION OF CONTRACT/ORDER NO. CON01000016
 10B. DATED (SEE ITEM 11) 06/15/01
 11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS The above numbered solicitation is amended as set forth in Item 14. The hour and date
specified for receipt of Offers is extended. is not extended. Offers must acknowledge receipt of this amendment prior to the hour and date specified in
the solicitation or as amended, by one of the following methods: (a)By completing items 8 and 15, and returning copies of the amendment; (b) By acknowledging
receipt of this amendment on each copy of the offer submitted; or (c) By separate letter or telegram which includes a reference to the solicitation and
amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR
THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR
OFFER. If by virtue of this amendment your desire to change an offer already submitted, such
change may be made by telegram or letter, provided each telegram or letter makes reference to
the solicitation and this amendment, and is received prior to the opening hour and date
specified. 12. ACCOUNTING AND APPROPIRATION DATA (If required) No Funding Information
 13. THIS ITEM ONLY APPLIES TO
MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE
CONTRACT/ORDER NO. AS DESCRIBED IN ITEM14. CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14
ARE MADE IN THE CONTRACT ORDER            NO. IN ITEM 10A. B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE
ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation
date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR
43.103(b). C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF: FAR 52.217-9, Option to Extend the Term of the Contract D. OTHER (Specify type of modification and authority) FAR 1.6, Authority of the Contracting Officer E. IMPORTANT:Contractor is not, | is required to sign this document and return copies to the issuing office. 14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including
solicitation/contract subject matter where feasible.) The purpose of this unilaterally executed modification is to exercise Option Period 4d. The
period of performance is hereby extended from July 15, 2007 through August 14, 2007. Funding in
the amount of $292,669.38 is funded via NANPA and will be paid by FCC Billing & Collection
Agent, Welch & Co. Except as provided herein, all terms and conditions of the document referenced in Item 9A or
10A, as heretofore changed, remains unchanged and in full force and effect. 15A. NAME AND TITLE OF SIGNER (Type or print) UNILATERAL MODIFICATION 1 6A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print) Anthony S. Wimbush 15B. CONTRACTOR/OFFEROR 1 5C. DATE SIGNED 16B UNITED STATES OF AMERICA 16C. DATE SIGNED (Signature of person authorized to sign) (Signature of Contracting Officer) 07/10/2007 7540-01-152-8070 Previous edition unusable STANDARD FORM30 (REV. 10-83) Prescribed by GSA FAR (48 CFR) 53.243