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Exhibit 10.5.2 AMENDMENT
            OF SOLICITATION/MODIFICATION OF CONTRACT
        
        
        1.
          CONTRACT ID CODE
        
        Page of Pages
          1            3
 2. AMENDMENT/MODIFICATION NO.
                0016
    
    
    3. EFFECTIVE DATE
    Oct 25, 2005
    
    
    4. REQUISITION/PURCHASE REQ. NO.
   NT1A911-6-0233ML
    
    
    5. PROJECT NO. (If applicable)
 6. ISSUED BY
DOC/NOAA/AGO
Staff Office & External Clients, AD
1305 East West Highway, Rm 7601
Silver Spring, MD 20910
JOEL L. PERLROTH 301-713-0838x205
    
    
    CODE  |   F600120I
    
    
    7. ADMINISTERED BY (If other than Item 6)
        SEE BLOCK 6
    
    
    CODE  |
 8.
            NAME AND ADDRESS OF CONTRACTOR (No., street, county, and
            Zip Code)
        
        
        þ
        
        
        9A.
          AMENDMENT OF SOLICITATION NO.9B.
          DATE (SEE ITEM 11)NEUSTAR,
            INC 
            46000 CENTER OAK PLAZA 
            STERLING VA 201666593
        Vendor
          ID: 00000190
                 DUNS: 112403295
                  CAGE: 3DXC3
        
        

þ
        
        
        10A.
          MODIFICATION OF CONTRACT/ORDER NO.SB1335-02-W-017510B.
          DATE (SEE ITEM 13)Oct 26, 2001
 CODE
    
    
    FACILITY CODE
 11.THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS
 
 o
    
    The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of
Offers       o is extended,       o 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 you 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 APPROPRIATION DATA (If required)$US          0.00
 
 
 
 þ
    
    
    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.o
    
    
        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).o
    
    
    C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:þ
    
    
    D. OTHER (Specify type of modification and authority)
             FAR 52.217-9 Option to Extend the Term of the Contract (MAR 2000)
 þ o
 
 Organized by UCF section headings, including solicitation/contract subject matter where feasible.)
   
     15A. NAME AND TITLE OF SIGNER (Type or print)
    
    
    
    16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)
JOEL L. PERLROTH            301-713-0838 x205 
Contracting Officer
Joel.L.Perlroth@noaa.gov15B.CONTRACTOR/OFFEROR 
___________________________________________    
(Signature of person authorized to sign)
    
    
    15C. DATE SIGNED
    
    
    16B. United States of America
By /s/ JOEL L. PERLROTH
      (Signature of Contracting Oficer)
    
    
    16C. DATE SIGNED10/25/2005
 NSN 7540-01-152-8070
        30-105
    STANDARD FORM 30 (REV. 10-83)PREVIOUS EDITIONS
    
    Prescribed by GSA FAR (48 CFR)UNUSABLE
    
    53.243




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SCHEDULEItem No.
    
    
    Supplies/Services
    
    
    Quantity
    
    
    Unit
    
    
    Unit Price
    
    
    Amount0002
    
    
    OPTION PERIOD ONE 
The Contractor must perform the services required
by the SOW.
Period of Performance: 365 days, beginning the
day after the Base Period expires
    
    
    
    1
    
    
    
    YR
    
    
    
    0.00
    
    
    
    
    0.00