content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001775672</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001158324</issuerCik>
        <issuerName>COGENT COMMUNICATIONS HOLDINGS, INC.</issuerName>
        <secFileNumber>000-51829</secFileNumber>
        <issuerAddress>
          <com:street1>2450 N STREET, NW</com:street1>
          <com:city>WASHINGTON</com:city>
          <com:stateOrCountry>DC</com:stateOrCountry>
          <com:zipCode>20037</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>2022954200</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Chang John B.</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Citi Global Markets, Inc.</name>
          <address>
            <com:street1>388 Greenwich Street</com:street1>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>1000</noOfUnitsSold>
        <aggregateMarketValue>74000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>48623846</noOfUnitsOutstanding>
        <approxSaleDate>12/21/2023</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/31/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1000</amountOfSecuritiesAcquired>
        <paymentDate>12/31/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>John Chang</name>
          <address>
            <com:street1>2450 N. Street, NW</com:street1>
            <com:city>Washington</com:city>
            <com:stateOrCountry>DC</com:stateOrCountry>
            <com:zipCode>20037</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>12/11/2023</saleDate>
        <amountOfSecuritiesSold>3000</amountOfSecuritiesSold>
        <grossProceeds>207000.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>John Chang</name>
          <address>
            <com:street1>2450 N. Street, NW</com:street1>
            <com:city>Washington</com:city>
            <com:stateOrCountry>DC</com:stateOrCountry>
            <com:zipCode>20037</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>common</securitiesClassTitle>
        <saleDate>12/14/2023</saleDate>
        <amountOfSecuritiesSold>500</amountOfSecuritiesSold>
        <grossProceeds>36000.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>12/21/2023</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>03/04/2022</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ John Chang</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3973}]
text: 144
  0001775672
  XXXXXXXX
  LIVE
  0001158324
  COGENT COMMUNICATIONS HOLDINGS, INC.
  000-51829
  2450 N STREET, NW
  WASHINGTON
  DC
  20037
  2022954200
  Chang John B.
  Officer
  Common
  Citi Global Markets, Inc.
  388 Greenwich Street
  New York
  NY
  10013
  1000
  74000.00
  48623846
  12/21/2023
  NASDAQ
  Common
  12/31/2022
  Stock Grant
  Issuer
  N
  1000
  12/31/2022
  Cash
  N
  John Chang
  2450 N. Street, NW
  Washington
  DC
  20037
  Common
  12/11/2023
  3000
  207000.00
  John Chang
  2450 N. Street, NW
  Washington
  DC
  20037
  common
  12/14/2023
  500
  36000.00
  12/21/2023
  03/04/2022
  /s/ John Chang