Exhibit 21.1
List of subsidiaries of Qualys, Inc.

Name of Subsidiary |  | Jurisdiction of Incorporation
Qualys International, Inc. |  | United States
Qualys Brazil Desenvolvimento de Produtos e Consultoria de Tecnologias de Seguranca LTDA. |  | Brazil
Qualys Canada, Ltd. |  | Canada
Qualys Technologies, S.A. |  | France
Qualys GmbH |  | Germany
Qualys Hong Kong Limited |  | Hong Kong
Qualys Security TechServices Private Ltd. |  | India
Qualys Japan K.K. |  | Japan
Qualys (Beijing) Information Technology Ltd. Corp. |  | People's Republic of China
Qualys Singapore Pte. Ltd. |  | Singapore
Qualys FZE |  | United Arab Emirates
Qualys Ltd. |  | United Kingdom