About Nslookup command you can review old blog articles.

Nslookup

I would like to highlight this interesting Microsoft article and debug switch to have more debug capability when nslookup is launched and there are some unknown DNS query problems.

Scripting - Il comando NSLOOKUP parte 2 (piu' DIG)

Scripting - comando nslookup

Server - How to verify that your mail server work properly

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Nslookup's debug mode is a useful troubleshooting feature; you can set the local computer into this mode by typing set debug , or for even greater detail, set d2 . In debug mode, Nslookup lists the steps being taken to complete its commands, as shown in this example:

C:\>nslookup

(null) testpc1.reskit.com

Address: 172.16.8.190

> set d2

> rain-city

(null) testpc1.reskit.com

Address: 172.16.8.190

------------

SendRequest(), len 49

HEADER:

opcode = QUERY, id = 2, rcode = NOERROR

header flags: query, want recursion

questions = 1, answers = 0, authority records = 0, additional = 0

QUESTIONS:

rain-city.reskit.com, type = A, class = IN

------------

Got answer (108 bytes):

HEADER:

opcode = QUERY, id = 2, rcode = NOERROR

header flags: response, auth. answer, want recursion, recursion avail.

questions = 1, answers = 2, authority records = 0, additional = 0

QUESTIONS:

rain-city.reskit.com, type = A, class = IN

ANSWERS:

-> rain-city.reskit.com

type = CNAME, class = IN, dlen = 31

canonical name = seattle.reskit.com

ttl = 86400 (1 day)

-> seattle.reskit.com

type = A, class = IN, dlen = 4

internet address = 172.16.2.3

ttl = 86400 (1 day)

------------

(null) seattle.reskit.com

Address: 172.16.2.3

Aliases: rain-city.reskit.com

Eng. Alessandro Mazzanti