EXHIBIT 99.1 CONTACT: - --------- Ann Candelario INS Investor Relations (408) 542-0151 ann candelario@ins.com - ---------------------- International Network Services Announces Intent to File Registration Statement for Follow-On Offering of Common Stock SUNNYVALE, CA - April 26, 1999 - International Network Services (NASDAQ: INSS), today announced that it intends to file a registration statement with the Securities and Exchange Commission in connection with a proposed public offering of approximately 3.5 million shares of its common stock. Of these shares, approximately 2 million would be offered by the Company and approximately 1.5 million by selling stockholders. The proposed offering will only be made, if at all, by means of a prospectus. Proceeds from the sale of the shares expected to be sold by the Company will be used for working capital and general corporate purposes.