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):
                                   June 11, 1998
  
  
                           CONCENTRIC NETWORK CORPORATION
  
                               ----------------------
  
               (Exact name of registrant as specified in its charter)
  
  
           Delaware                     0-22575              65-0257497
           --------                     -------              ----------
  (State or other jurisdiction        (Commission         (I.R.S. Employer
        of incorporation)             File Number)       Identification No.)
   
                               10590 N. Tantau Avenue
                           Cupertino, California  95014
  
                      (Address of Principal Executive Offices)
                                     (Zip Code)
  
         Registrant's telephone number, including area code: (408) 342-2800
  
  
                                    Not Applicable
  
                               ----------------------
  
           (Former name or former address, if changed since last report)
  
  ================================================================================
  <PAGE>
   
  This report is filed on behalf of Concentric Network Corporation.
  
  ITEM 5. OTHER EVENTS.
   
            On June 3, 1998, Concentric Network Corporation announced that it has
  entered into an agreement to sell $150 million of 13 1/2%  Senior Redeemable
  Exchangeable Preferred Stock due 2010.  Each share of Preferred Stock will have
  a liquidation preference of $1,000 per share.  This offering is being made
  within the United States to qualified investors.
  
            The Company intends to use the proceeds of the offering to fund
  potential acquisitions and for working capital purposes.
  
             This announcement is neither an offer to sell nor a solicitation to
  buy any of these securities.
  
            These securities have not been registered under the Securities Act of
  1933, as amended (the "Securities Act"), or any state securities laws and,
  unless so registered, may not be offered or sold in the United States except
  pursuant to an exemption from, or in a transaction not subject to, the
  registration requirements of the Securities Act and  applicable state securities
  laws.
  
  
  ITEM 7. EXHIBITS.
  
             (c) Exhibits:
  
   
   Exhibit
    Number
   ---------
   99.1      June 3, 1998 Press Release: Concentric Network Corporation
             Announces Pricing of $150 Million Offering of 13 1/2% Senior
             Redeemable Exchangeable Preferred Stock Due 2010
   
   
  
                                        -2-
  <PAGE>
   
                                     SIGNATURES
  
         Pursuant to the requirements of the Securities Exchange Act of 1934, as
  amended, the registrant has duly caused this report to be signed on its behalf
  by the undersigned hereunto duly authorized.
  
  
  Dated: June 11, 1998
                                       CONCENTRIC NETWORK CORPORATION
  
  
                                       ---------------------------------------
                                       (Registrant)
  
  
                                       By:  /s/  Michael F. Anthofer
                                          ____________________________________
                                          Name:  Michael F. Anthofer
                                          Title:    Senior Vice President, 
                                                    Finance and Chief Financial 
                                                    Officer
  
                                        -3-
  <PAGE>
   
                                   EXHIBIT INDEX
  
                              DESCRIPTION OF DOCUMENT
  
  Exhibit
   Number
  -------
  
    99.1     June 3, 1998 Press Release: "Concentric Network Corporation Prices
             $150 Million Offering of 13 1/2% Senior Redeemable Exchangeable
             Preferred Stock Due 2010
  
                                        -4-
metadata_documents: [{"type": "8-K", "sequence": "1", "description": "FORM 8-K", "secsgml_size_bytes": 4237}]
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": "98646613"}, "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):
                                   June 11, 1998
  
                           CONCENTRIC NETWORK CORPORATION
  
                               ----------------------
  
               (Exact name of registrant as specified in its charter)
  
           Delaware                     0-22575              65-0257497
           --------                     -------              ----------
  (State or other jurisdiction        (Commission         (I.R.S. Employer
        of incorporation)             File Number)       Identification No.)
   
                               10590 N. Tantau Avenue
                           Cupertino, California  95014
  
                      (Address of Principal Executive Offices)
                                     (Zip Code)
  
         Registrant's telephone number, including area code: (408) 342-2800
  
                                    Not Applicable
  
                               ----------------------
  
           (Former name or former address, if changed since last report)
  
  ================================================================================
  This report is filed on behalf of Concentric Network Corporation.
  
  ITEM 5. OTHER EVENTS.
   
            On June 3, 1998, Concentric Network Corporation announced that it has
  entered into an agreement to sell $150 million of 13 1/2%  Senior Redeemable
  Exchangeable Preferred Stock due 2010.  Each share of Preferred Stock will have
  a liquidation preference of $1,000 per share.  This offering is being made
  within the United States to qualified investors.
  
            The Company intends to use the proceeds of the offering to fund
  potential acquisitions and for working capital purposes.
  
             This announcement is neither an offer to sell nor a solicitation to
  buy any of these securities.
  
            These securities have not been registered under the Securities Act of
  1933, as amended (the "Securities Act"), or any state securities laws and,
  unless so registered, may not be offered or sold in the United States except
  pursuant to an exemption from, or in a transaction not subject to, the
  registration requirements of the Securities Act and  applicable state securities
  laws.
  
  ITEM 7. EXHIBITS.
  
             (c) Exhibits:
  
   
   Exhibit
    Number
   ---------
   99.1      June 3, 1998 Press Release: Concentric Network Corporation
             Announces Pricing of $150 Million Offering of 13 1/2% Senior
             Redeemable Exchangeable Preferred Stock Due 2010
   
   
  
                                        -2-
  SIGNATURES
  
         Pursuant to the requirements of the Securities Exchange Act of 1934, as
  amended, the registrant has duly caused this report to be signed on its behalf
  by the undersigned hereunto duly authorized.
  
  Dated: June 11, 1998
                                       CONCENTRIC NETWORK CORPORATION
  
                                       ---------------------------------------
                                       (Registrant)
  
                                       By:  /s/  Michael F. Anthofer
                                          ____________________________________
                                          Name:  Michael F. Anthofer
                                          Title:    Senior Vice President, 
                                                    Finance and Chief Financial 
                                                    Officer
  
                                        -3-
  EXHIBIT INDEX
  
                              DESCRIPTION OF DOCUMENT
  
  Exhibit
   Number
  -------
  
    99.1     June 3, 1998 Press Release: "Concentric Network Corporation Prices
             $150 Million Offering of 13 1/2% Senior Redeemable Exchangeable
             Preferred Stock Due 2010
  
                                        -4-