Certificate and Client Directory search Search BSI’s directory for BSI certified clients and valid certificate numbers by company name, certificate or licence number, standard or scheme and location. For enquiries on granted, suspended, or withdrawn certificates please contact your local BSI office. * Please supply search criteria for at least one of these items. This client directory search will not provide more than 25 results. For more information, visit our help section about how to search the Client Directory. Please note between 8am and 9am the directory updates itself and may give zero results, please try again later.