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nslookup: am I doing it right?

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# 1  
Old 01-05-2011
nslookup: am I doing it right?
Hi guys,

I'm back to get some help again Smilie

I have a file that has a list of IP addresses, and I use nslookup in my script to resolve hostnames of those IPs.

the problem I'm facing is that I not all the hostnames got resolved! and I don't know why. sometimes the same duplicate IP returns a hostname once and nothing the other.
like:
Quote:
1.2.3.4 number.com
1.2.3.4
what could be the problem?

thanks in advance
# 2  
Old 01-05-2011
Afaik. "nslookup" does not search arbitary files.
What did you type?
This User Gave Thanks to methyl For This Post:
Abdulelah
# 3  
Old 01-05-2011
the following:

Quote:
nslookup $a | grep -i "name =" | awk '{print $4}'
where the IP address is obtaind from a variable in a loop,
Last edited by Abdulelah; 01-05-2011 at 02:01 PM..
# 4  
Old 01-05-2011
I think what u are looking for is this :
Code:
# dig -x 67.195.160.76 +short 
ir1.fp.vip.ac4.yahoo.com.

Code:
dig -x 67.195.160.76

; <<>> DiG 9.7.0-P1 <<>> -x 67.195.160.76
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54543
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;76.160.195.67.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:
76.160.195.67.in-addr.arpa. 1200 IN     PTR     ir1.fp.vip.ac4.yahoo.com.

;; Query time: 64 msec
;; SERVER: 10.237.129.4#53(10.237.129.4)
;; WHEN: Wed Jan  5 21:07:07 2011
;; MSG SIZE  rcvd: 82

This User Gave Thanks to mtomar For This Post:
Abdulelah
# 5  
Old 01-05-2011
What does this do:
Code:
nslookup < file

Without a loop
Last edited by Scrutinizer; 01-05-2011 at 02:29 PM..
This User Gave Thanks to Scrutinizer For This Post:
Abdulelah
# 6  
Old 01-05-2011
In my version of "nslookup", the "Name" line contains a colon character not an equals sign. i.e. "Name:" not "Name =".
Please post sample unfiltered output from your "nslookup".


We haven't seen your "loop".
The "nslookup" command would normally only have one parameter in this context. If you give it the lines from your file verbatim in some cases it will be giving "nslookup" two parameters ... with the second parameter interpreted as the name of the nameserver (depending on whether the sample in post #1 is input or output).

There are a lot more complex answers if your nameserver is faulty or if there are multiple nameservers.
Last edited by methyl; 01-05-2011 at 02:45 PM..
This User Gave Thanks to methyl For This Post:
Abdulelah
# 7  
Old 01-05-2011
here is the output of my nslookup version:

Quote:
Server: 212.121.0.5
Address: 212.121.0.5#53

Non-authoritative answer:
76.160.195.67.in-addr.arpa name = ir1.fp.vip.ac4.yahoo.com.

Authoritative answers can be found from:
160.195.67.in-addr.arpa nameserver = ns5.yahoo.com.
160.195.67.in-addr.arpa nameserver = ns1.yahoo.com.
160.195.67.in-addr.arpa nameserver = ns2.yahoo.com.
160.195.67.in-addr.arpa nameserver = ns4.yahoo.com.
160.195.67.in-addr.arpa nameserver = ns3.yahoo.com.
ns1.yahoo.com internet address = 68.180.131.16
ns2.yahoo.com internet address = 68.142.255.16
ns3.yahoo.com internet address = 121.101.152.99
ns4.yahoo.com internet address = 68.142.196.63
ns5.yahoo.com internet address = 119.160.247.124
---------- Post updated at 06:53 PM ---------- Previous update was at 06:51 PM ----------

Quote:
Originally Posted by mtomar
I think what u are looking for is this :
Code:
# dig -x 67.195.160.76 +short 
ir1.fp.vip.ac4.yahoo.com.

Code:
dig -x 67.195.160.76

; <<>> DiG 9.7.0-P1 <<>> -x 67.195.160.76
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54543
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;76.160.195.67.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:
76.160.195.67.in-addr.arpa. 1200 IN     PTR     ir1.fp.vip.ac4.yahoo.com.

;; Query time: 64 msec
;; SERVER: 10.237.129.4#53(10.237.129.4)
;; WHEN: Wed Jan  5 21:07:07 2011
;; MSG SIZE  rcvd: 82

thanks for that, but it doesn't work all the time.. just like nslookup
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