"nslookup" Command

The nslookup command can be used in Windows and Unix-based to find various information related to DNS ( Domain Name Server ) including the IP addresses, MX records for a domain or the NS Servers of a domain.

1. To look up the reverse for an IP address :

C:\>nslookup
Default Server:  cns3.tm.net.my
Address:  202.188.0.133

> set q=a
> 203.158.28.18
Server:  cns3.tm.net.my
Address:  202.188.0.133

Name:    cdns1.bizsurf.net
Address:  203.158.28.18

>

2. To make query using another server :

> server 202.188.1.5
Default Server:  [202.188.1.5]
Address:  202.188.1.5

> www.justk2.com
Server:  [202.188.1.5]
Address:  202.188.1.5

Non-authoritative answer:
Name:    justk2.com
Address:  202.75.41.193
Aliases:  www.justk2.com

>

3. To look up the forward for a Fully Qualified Domain Name (FQDN) address :

> set q=a

> www.justk2.com
Server:  cns3.tm.net.my
Address:  202.188.0.133

Non-authoritative answer:
Name:    justk2.com
Address:  202.75.41.193
Aliases:  www.justk2.com

>

4. To look up the Server of Authority (SOA) record :

> set q=soa
> justk2.com
Server:  cns3.tm.net.my
Address:  202.188.0.133

Non-authoritative answer:
justk2.com
        primary name server = ns1.everydns.net
        responsible mail addr = hostmaster.justk2.com
        serial  = 1214570007
        refresh = 3600 (1 hour)
        retry   = 900 (15 mins)
        expire  = 1209600 (14 days)
        default TTL = 3600 (1 hour)
>

5. To look up the Mail Exchanger (MX) record :

> set q=mx
> justk2.com
Server:  cns3.tm.net.my
Address:  202.188.0.133

Non-authoritative answer:
justk2.com      MX preference = 5, mail exchanger = mail.justk2.com
justk2.com      MX preference = 50, mail exchanger = bkpmail.localdns.com

bkpmail.localdns.com    internet address = 202.75.41.58
mail.justk2.com internet address = 202.190.203.180
>

6. To look up all records for a particular FQDN address :

> set q=any
> justk2.com
Server:  cns3.tm.net.my
Address:  202.188.0.133

Non-authoritative answer:
justk2.com
        primary name server = ns1.everydns.net
        responsible mail addr = hostmaster.justk2.com
        serial  = 1214570007
        refresh = 3600 (1 hour)
        retry   = 900 (15 mins)
        expire  = 1209600 (14 days)
        default TTL = 3600 (1 hour)
>

7. To look up what name server handles the reverse for a particular class network ( i.e. 202.75.41.* ) :

> set q=any
> 41.75.202.in-addr.arpa
Server:  cns3.tm.net.my
Address:  202.188.0.133

Non-authoritative answer:
41.75.202.in-addr.arpa  nameserver = ns02.myloca.com
41.75.202.in-addr.arpa  nameserver = ns01.myloca.com

41.75.202.in-addr.arpa  nameserver = ns02.myloca.com
41.75.202.in-addr.arpa  nameserver = ns01.myloca.com
ns02.myloca.com internet address = 202.75.34.2
ns01.myloca.com internet address = 202.75.34.1
>