Exhibit (a)(1)(D) Notice of Guaranteed Delivery for Tender of Shares of Common Stock and Tender of Shares of Series A 6.75% Convertible Preferred Stock of Verio Inc. THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON WEDNESDAY, JUNE 14, 2000, UNLESS THE OFFER IS EXTENDED. This form, or one substantially equivalent hereto, must be used to accept the Offer (as defined below) if certificates for shares of common stock, par value $.001 per share ("Common Stock"), or shares of Series A 6.75% Convertible Preferred Stock, par value $.001 per share ("Preferred Stock" and together with the Common Stock, the "Shares"), of Verio Inc., a Delaware corporation (the "Company"), are not immediately available or if the procedure for book-entry transfer cannot be completed on a timely basis or time will not permit all required documents to reach the Depositary on or prior to the Expiration Date (as defined in the Offer to Purchase). Such form may be delivered by hand, facsimile transmission, or mail to the Depositary. See Section 4 of the Offer to Purchase, dated May 17, 2000 (the "Offer to Purchase"). The Depositary for the Offer is: Norwest Bank Minnesota, N.A. By Mail: By Hand in New York: By Hand or Overnight Delivery: Norwest Bank Minnesota, The Depository Trust N.A. Company Norwest Bank Minnesota, P.O. Box 64858 Transfer Agent Drop N.A. St. Paul, MN 55164-0858 55 Water Street--1st 161 North Concord Attn: Shareowner Services Floor Exchange New York, NY 10041-0099 South St. Paul, MN 55075 Facsimile for Eligible Institutions only: (651) 450-4163 To confirm receipt of Notice of Guaranteed Delivery: (651) 450-4110 If you require additional information, please call Norwest Bank Minnesota, N.A. at (800) 468-9716 or (651) 450-4064 DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS, OR TRANSMISSION OF INSTRUMENTS VIA A FACSIMILE, OTHER THAN AS SET FORTH ABOVE, DOES NOT CONSTITUTE A VALID DELIVERY TO THE DEPOSITARY. This Notice of Guaranteed Delivery is not to be used to guarantee signatures. If a signature on a Letter of Transmittal is required to be guaranteed by an "Eligible Institution" (as defined in the Offer to Purchase) under the instructions thereto, such signature guarantee must appear in the applicable space provided in the signature box on the Letter of Transmittal. The Eligible Institution that completes this form must communicate the guarantee to the Depositary and must deliver the Letter of Transmittal or an Agent's Message and certificates for Shares to the Depositary within the time period shown herein. Failure to do so could result in a financial loss to such Eligible Institution. THE GUARANTEE ON THE REVERSE SIDE MUST BE COMPLETED. Ladies and Gentlemen: The undersigned hereby tenders to Chaser Acquisition, Inc., a Delaware corporation, upon the terms and subject to the conditions set forth in the Offer to Purchase, and the related Letter of Transmittal, receipt of which are hereby acknowledged, Shares of the Company, pursuant to the guaranteed delivery procedure set forth in Section 4 of the Offer to Purchase. Number of shares of Common Stock:__ SIGN HERE Number of shares of Preferred Stock:_____________________________ Name(s) of Record Holder(s): Certificate No(s). (if available): ___________________________________ ___________________________________ ___________________________________ ___________________________________ (Please Print) If Securities will be tendered by Address(es):_______________________ book-entry transfer at The Depository Trust Company, please provide Account No.:_______________ ___________________________________ (Zip Code) Area Code and Telephone No(s): ___________________________________ Dated:_____________________________ ___________________________________ ___________________________________ GUARANTEE (Not to be used for signature guarantee) The undersigned, a bank, broker, dealer, credit union, savings association or other entity which is a member in good standing of the Securities Transfer Agents Medallion Program, guarantees the delivery to the Depositary of the Shares tendered hereby, together with a properly completed and duly executed Letter of Transmittal (or manually signed facsimile(s) thereof) and any other required documents, or an Agent's Message (as defined in the Offer to Purchase) in the case of a book-entry delivery of Shares, all within three trading days of the date hereof. A "trading day" is any day on which the New York Stock Exchange is open for business. Name of Firm:______________________ Title:_____________________________ ___________________________________ Name:______________________________ (Authorized Signature) (Please Print or Type) Address:___________________________ Area Code and Telephone No.:_______ ___________________________________ Dated:_____________________________ (Zip Code) DO NOT SEND CERTIFICATES FOR SHARES WITH THIS FORM--CERTIFICATES SHOULD BE SENT WITH YOUR LETTER OF TRANSMITTAL 2