<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001558242</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001107843</issuerCik>
            <issuerName>QUALYS, INC.</issuerName>
            <secFileNumber>001-35662</secFileNumber>
            <issuerAddress>
                <ns2:street1>919 E. Hillsdale Boulevard, 4th Floor</ns2:street1>
                <ns2:city> Foster City</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>94404</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>6508016100</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SUMEDH SHRINAND THAKAR</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>34000</noOfUnitsSold>
            <aggregateMarketValue>4630120.00</aggregateMarketValue>
            <noOfUnitsOutstanding>36326126</noOfUnitsOutstanding>
            <approxSaleDate>05/29/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/29/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>26000</amountOfSecuritiesAcquired>
            <paymentDate>05/29/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/01/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units &amp; Performance Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>8000</amountOfSecuritiesAcquired>
            <paymentDate>02/01/2024</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for SUMEDH THAKAR</name>
                <address>
                    <ns2:street1>919 E. Hillsdale Boulevard, 4th Floor</ns2:street1>
                    <ns2:city> Foster City</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94404</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/14/2025</saleDate>
            <amountOfSecuritiesSold>7000</amountOfSecuritiesSold>
            <grossProceeds>866663.70</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for SUMEDH THAKAR</name>
                <address>
                    <ns2:street1>919 E. Hillsdale Boulevard, 4th Floor</ns2:street1>
                    <ns2:city> Foster City</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94404</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/14/2025</saleDate>
            <amountOfSecuritiesSold>7000</amountOfSecuritiesSold>
            <grossProceeds>876272.60</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. The securities to be sold were acquired upon the vesting of restricted stock &amp; performance stock units during the period of 02/01/2024 through 1/30/2025
</remarks>
        <noticeSignature>
            <noticeDate>05/29/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>02/26/2025</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Sumedh Shrinand Thakar</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 5869}]
144
0001558242
XXXXXXXX
LIVE
0001107843
QUALYS, INC.
001-35662
919 E. Hillsdale Boulevard, 4th Floor
Foster City
CA
94404
6508016100
SUMEDH SHRINAND THAKAR
Director
Officer
COMMON
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
34000
4630120.00
36326126
05/29/2025
NASDAQ
Common
05/29/2025
Exercise of Stock Options
Issuer
N
26000
05/29/2025
Cash
Common
02/01/2024
Restricted Stock Units & Performance Stock Units
Issuer
N
8000
02/01/2024
N/A
N
10b5-1 Sales Plan for SUMEDH THAKAR
919 E. Hillsdale Boulevard, 4th Floor
Foster City
CA
94404
Common
04/14/2025
7000
866663.70
10b5-1 Sales Plan for SUMEDH THAKAR
919 E. Hillsdale Boulevard, 4th Floor
Foster City
CA
94404
Common
03/14/2025
7000
876272.60
The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. The securities to be sold were acquired upon the vesting of restricted stock & performance stock units during the period of 02/01/2024 through 1/30/2025
05/29/2025
02/26/2025
/s/ Sumedh Shrinand Thakar