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What is it about?
Domain Name Service (DNS) is a service that ensures translation between IP addresses (18.104.22.168) and domain names (e.g. google.com). Port 53/tcp or 53/udp is generally used.
This service is depicted in following RFCs:
DNS analysis is an important step in the reconnaissance process of a penetration test as it provides the auditor with relevant information about the target.
For more information, please refer to http://fr.wikipedia.org/wiki/Domain_Name_System.