A reconnaissance determines all the publically accessible information about an objective or company and analyses this for possible ‘information leaks’. This is because, before an attacker attacks a company, he tries to exploit any little pieces of information from public sources, e.g. addresses, emails, employees, financial circumstances, communication channels, technologies, DNS entries, business relationships, running systems or administrators. This information is often a gold mine because it can provide the attacker with information about internal procedures. We put ourselves in the role of a potential attacker and collect all the information about a company we can find on the internet.