Technopits

 Nslookup

 DNS ( Domain Name Servers ) contain all the sensitive information which is essential for to communicate with the network.  

If you are going to send or  receive mail then your network require MX record which record contains the IP address of the mail serve.

  Example

04/18/00 13:55:37 dns example.com
Mail for example.com is handled by server1.example.org
Canonical name: new riders.org
Addresses:
40.40.40.5
 40.40.40.15

That's it attacker gets your ip address. 

Now attacker can start Mapping out the network.

Another alternative for getting your ip address is that simply PING the domain name.

For example .

Pinging newriders.com [20.20.20.8] with 32 bytes of data::

Request timed out.

Request timed out.

Ping statistics for 20.20.20.20:

Packets: Sent = 2, Received = 0, Lost = 2 (100% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 0ms, Average = 0ms Control-C

After finding your IP address now attacker has a couple of reason to   used this  as a staring point to start with it . 

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