Gather DNS information about the target is of vital information when conducting a penetration testing. DNS mapping information can reveal the internal architecture of the organizations IT infrastructure. Usually the Intrusion Detection Systems (IDS) do not monitor DNS traffic so it is a good point to get a peek in to companies internal network. DNS Dumspter
is an online server that give DNS Lookup information without installing any software and without revealing identity. It give information about the IP their mappings and an image to let us better relate how they are connected. It visualize all the sub-domains that of a particular domain. A sample DNS view for Stakoverflow.com is as below.