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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 8yaFfUGJyH4JF1okJQNDXg==

<SEC-DOCUMENT>0001104659-05-031521.txt : 20050712
<SEC-HEADER>0001104659-05-031521.hdr.sgml : 20050712
<ACCEPTANCE-DATETIME>20050707163130
ACCESSION NUMBER:		0001104659-05-031521
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050705
FILED AS OF DATE:		20050707
DATE AS OF CHANGE:		20050707

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NEUSTAR INC
		CENTRAL INDEX KEY:			0001265888
		STANDARD INDUSTRIAL CLASSIFICATION:	COMMUNICATION SERVICES, NEC [4899]
		IRS NUMBER:				000000000

	BUSINESS ADDRESS:	
		STREET 1:		46000 CENTER OAK PLAZA
		CITY:			STERLING
		STATE:			VA
		ZIP:			20166
		BUSINESS PHONE:		571-434-5400

	MAIL ADDRESS:	
		STREET 1:		46000 CENTER OAK PLAZA
		CITY:			STERLING
		STATE:			VA
		ZIP:			20166

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SCHIFF FRANK L
		CENTRAL INDEX KEY:			0001115031

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32548
		FILM NUMBER:		05943722

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		2124971400

	MAIL ADDRESS:	
		STREET 1:		320 PARK AVENUE
		STREET 2:		17TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-07-05</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001265888</issuerCik>
        <issuerName>NEUSTAR INC</issuerName>
        <issuerTradingSymbol>NSR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001115031</rptOwnerCik>
            <rptOwnerName>SCHIFF FRANK L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>320 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>17TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-07-05</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4208481</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>22.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4047587</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purposes.</footnote>
        <footnote id="F2">These shares are owned directly by MidOcean Capital Investors, L.P. and indirectly by the reporting person as a managing director of entities that indirectly control this entity. Of these shares, 1,220,546 are held by the NeuStar, Inc. Voting Trust.  MidOcean Capital Investors, L.P. is the direct owner of the reported securities (the &quot;Shares&quot;). MidOcean Associates, SPC, a Cayman Islands exempted company registered as a segregated portfolio company (&quot;Associates&quot;), MidOcean Partners, LP, a Cayman limited partnership (&quot;MidOcean&quot;), Existing Fund GP, Ltd., a Cayman Islands exempted company (&quot;Existing Fund&quot;) and MidOcean Capital Partners, L.P., a Delaware limited partnership (&quot;MOCP&quot;), may all be deemed to be beneficial owners of the Shares as a result of their direct or indirect control relationship with MidOcean Capital Investors, L.P., a Delaware limited partnership (&quot;MCILP&quot;).</footnote>
        <footnote id="F3">MOCP is the general partner of MCILP. Existing Fund is the general partner of MOCP. MidOcean is the sole owner of Existing Fund and a limited partner in MOCP, and Associates is the general partner of MidOcean. Ultramar Capital Ltd., a Cayman Islands exempted company (&quot;Ultramar&quot;), is the sole owner of Associates. J. Edward Virtue may be deemed the beneficial owner of the Shares because he indirectly controls the Shares, but disclaims beneficial ownership except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Martin Lowen, by power of attorney</signatureName>
        <signatureDate>2005-07-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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