You can find your IP address by going to this page: http://status.ducocube.com/ . You will need to tell us your IP address so that we can add it to the whitelist of allowed addresses from where Duco is accessible.
Note that your organisation may use more than one public IP addresses; often one IP address per location. E.g., if you have an office in London and one in New York, the two offices will probably use two different public IP addresses. Your technology team should be able to provide all the details.