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landing/docs/Linux-Commands/Networking/133-the-nslookup-command.md

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+# The `nslookup` command
+
+The `nslookup` command is a network administration command-line tool for querying the Domain Name System (DNS) to obtain domain name or IP address mapping or any other specific DNS record.
+
+## Syntax
+
+```
+nslookup [options] [host]
+```
+
+## Options
+Some popular option flags include:
+
+```
+-domain=[domain-name]	Change the default DNS name.
+-debug	Show debugging information.
+-port=[port-number]	Specify the port for queries. The default port number is 53.
+-timeout=[seconds]	Specify the time allowed for the server to respond.
+-type=a	View information about the DNS A address records.
+-type=any	View all available records.
+-type=hinfo	View hardware-related information about the host.
+-type=mx	View Mail Exchange server information.
+-type=ns	View Name Server records.
+-type=ptr	View Pointer records. Used in reverse DNS lookups.
+-type=soa	View Start of Authority records.
+```
+
+## Few Examples:
+1. Query DNS Server
+```
+nslookup www.google.com
+```
+
+2. Specify a port to query
+```
+nslookup -port=53 www.google.com
+```
+
+3. Get the MX Record
+```
+nslookup -type=mx google.com
+```
+
+Here I showed you how to use the nslookup command in Linux. Although there are other DNS lookup tools, such as dig, nslookup could be a better choice as it is a powerful tool present in almost every system.
+
+For more details: [Nslookup on Wikipedia](https://en.wikipedia.org/wiki/Nslookup)