content: <PAGE>
  
  ================================================================================
  
  
                        SECURITIES AND EXCHANGE COMMISSION
  
                              WASHINGTON, D.C. 20549
  
  
                                     FORM 8-K
  
                 CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                        THE SECURITIES EXCHANGE ACT OF 1934
  
        Date of Report (Date of earliest event reported):  October 1, 1999
  
                          CONCENTRIC NETWORK CORPORATION
  
                            ___________________________
  
  
              (Exact name of Registrant as specified in its charter)
  
            Delaware                    000-22575                65-0257497
            --------                    ---------                ----------
  (State or other jurisdiction of      (Commission            (I.R.S. Employer
  incorporation or organization)       File Number)        Identification Number)
  
  
  
       1400 Parkmoor Avenue                                        94563
     San Jose, California 95126                                  (Zip Code)
   (Address of Principal Executive
              Offices)
  
  
        Registrant's telephone number, including area code: (408) 817-2800
  
  
                                  Not Applicable
                            ___________________________
           (Former name or former address, if changed since last report)
  
  
  
  
  
  
  
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  <PAGE>
  
  ITEM 5.   OTHER EVENTS
  
       On October 18, 1999, Concentric Network Corporation, a Delaware corporation
  ("Concentric") purchased for approximately $54 million in stock and cash,
  subject to adjustment, substantially all the assets of 9Net Avenue, Inc., a New
  Jersey corporation ("9Net"), and assumed approximately $9.9 million in
  liabilities of 9Net pursuant to an Asset Purchase Agreement dated October 1,
  1999 by and among Concentric, 9Net and the principal stockholders of 9Net.
  
       A copy of each of the Agreement and the press release of Concentric dated
  October 18, 1999 and issued in connection with the closing of the transaction,
  is filed as an exhibit hereto and is incorporated herein by reference.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS
  
       (c)  EXHIBITS
  
            2.1   Asset Purchase Agreement dated as of October 1, 1999, by and
                  among Concentric Network Corporation, 9Net Avenue, Inc. and the
                  Principal Stockholders.
  
            99.1  Press Release of Concentric Network Corporation dated
                  October 18, 1999.
  
                                        -2-
  <PAGE>
  
                                     SIGNATURE
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  registrant has duly caused this report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
                                   CONCENTRIC NETWORK CORPORATION
  
  Date:  October 22, 1999          By: /s/ Michael Anthofer
                                       -------------------------------------------
                                        Michael Anthofer
                                        Senior Vice President and Chief Financial
                                        Officer
metadata_documents: [{"type": "8-K", "sequence": "1", "description": "FORM 8-K", "secsgml_size_bytes": 3228}]
metadata_filer: {"company-data": {"conformed-name": "CONCENTRIC NETWORK CORP", "cik": "0001007304", "assigned-sic": "4813", "irs-number": "650257497", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-22575", "film-number": "99732539"}, "business-address": {"street1": "10590 N TANTAU AVE", "city": "CUPERTINO", "state": "CA", "zip": "95014", "phone": "4083422800"}, "mail-address": {"street1": "10590 NORTH TANTAU AVENUE", "city": "CUPERTINO", "state": "CA", "zip": "95014"}}
text: ================================================================================
  
                        SECURITIES AND EXCHANGE COMMISSION
  
                              WASHINGTON, D.C. 20549
  
                                     FORM 8-K
  
                 CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                        THE SECURITIES EXCHANGE ACT OF 1934
  
        Date of Report (Date of earliest event reported):  October 1, 1999
  
                          CONCENTRIC NETWORK CORPORATION
  
                            ___________________________
  
              (Exact name of Registrant as specified in its charter)
  
            Delaware                    000-22575                65-0257497
            --------                    ---------                ----------
  (State or other jurisdiction of      (Commission            (I.R.S. Employer
  incorporation or organization)       File Number)        Identification Number)
  
       1400 Parkmoor Avenue                                        94563
     San Jose, California 95126                                  (Zip Code)
   (Address of Principal Executive
              Offices)
  
        Registrant's telephone number, including area code: (408) 817-2800
  
                                  Not Applicable
                            ___________________________
           (Former name or former address, if changed since last report)
  
  ================================================================================
  ITEM 5.   OTHER EVENTS
  
       On October 18, 1999, Concentric Network Corporation, a Delaware corporation
  ("Concentric") purchased for approximately $54 million in stock and cash,
  subject to adjustment, substantially all the assets of 9Net Avenue, Inc., a New
  Jersey corporation ("9Net"), and assumed approximately $9.9 million in
  liabilities of 9Net pursuant to an Asset Purchase Agreement dated October 1,
  1999 by and among Concentric, 9Net and the principal stockholders of 9Net.
  
       A copy of each of the Agreement and the press release of Concentric dated
  October 18, 1999 and issued in connection with the closing of the transaction,
  is filed as an exhibit hereto and is incorporated herein by reference.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS
  
       (c)  EXHIBITS
  
            2.1   Asset Purchase Agreement dated as of October 1, 1999, by and
                  among Concentric Network Corporation, 9Net Avenue, Inc. and the
                  Principal Stockholders.
  
            99.1  Press Release of Concentric Network Corporation dated
                  October 18, 1999.
  
                                        -2-
  SIGNATURE
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  registrant has duly caused this report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
                                   CONCENTRIC NETWORK CORPORATION
  
  Date:  October 22, 1999          By: /s/ Michael Anthofer
                                       -------------------------------------------
                                        Michael Anthofer
                                        Senior Vice President and Chief Financial
                                        Officer