<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-12-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001777946</issuerCik>
        <issuerName>IronNet, Inc.</issuerName>
        <issuerTradingSymbol>IRNT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001543405</rptOwnerCik>
            <rptOwnerName>LaPenta Robert V Jr</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O IRONNET, INC.,7900 TYSONS ONE PLACE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 400</rptOwnerStreet2>
            <rptOwnerCity>MCLEAN</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>22102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2021-12-07</value>
                <footnoteId id="F2"/>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>24000</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>49000</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The security represents restricted stock units granted to the reporting person. Each restricted stock unit represents a contingent right to receive one share of common stock of the issuer.</footnote>
        <footnote id="F2">On December 7, 2021, the issuer's compensation committee approved the grant of restricted stock units to each of the issuer's non-employee directors pursuant to the issuer's 2021 Equity Incentive Plan.</footnote>
        <footnote id="F3">Of the shares underlying this restricted stock unit award, one-third will vest on August 26 of each of 2022, 2023 and 2024, subject to the reporting person's continued service with the issuer as of the applicable date.</footnote>
        <footnote id="F4">Includes 25,000 shares received in a non-reportable pro rata distribution from LGL Systems Acquisition Holding Company, LLC (the &quot;Sponsor&quot;).  In prior reports, the reporting person reported beneficial ownership of 3,470,375 shares of the issuer's common stock held by the Sponsor.  The reporting person was previously a manager of the managing member of the Sponsor, which status ceased prior to the pro rata distribution to the Sponsor's members.</footnote>
    </footnotes>

    <remarks>Exhibit 24 -- Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Brian F. Leaf, attorney-in-fact</signatureName>
        <signatureDate>2021-12-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
