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Playing with whois & dig - getting all the a records (globally)


 
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# 1  
Debian Playing with whois & dig - getting all the a records (globally)

Dear All,

I want to get all the IPs of the A RECORDS for mail.google.com.
The aim is to deny access to these IPs.
I learnt that mail.google.com has several IPs.

I did the following steps:
1. whois google.com
2. I got the following as its DOMAIN SERVERS:
Quote:
ns3.google.com
ns2.google.com
ns1.google.com
ns4.google.com
3.# dig @ns1.google.com a mail.google.com

Code:
;; ANSWER SECTION:
mail.google.com.    0    IN    CNAME    googlemail.l.google.com.
googlemail.l.google.com. 300    IN    A    74.125.233.86
googlemail.l.google.com. 300    IN    A    74.125.233.85

I thought this would give me all the IPs.Smilie

Currently, in an attempt to get the other IPs I am digging 4.2.2.2 & other free public dns servers..

someone please explain to me why
Code:
dig @ns1.google.com  a mail.google.com

does not give the full list & how other FreeDNS servers are getting different IPs?
# 2  
No Answers Smilie

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