Jtdylktuy

nslookup was never really intended for scripted use. You really want to use dig instead, which with the +short option produces machine-readable output according to the query parameters.

dig +short myip.opendns.com @resolver1.opendns.com

This is a good usecase for awk.

nslookup myip.opendns.com resolver1.opendns.com | awk -F': ' 'NR==6 { print $2 } '

Here we are piping to awk, delimiting by ": " and then only outputting the second delimited field of line 6.

If you're on Windows, and have PowerShell installed (v1 or better) (and a .Net version) you could use a (long) one-liner like this:

[System.Net.Dns]::GetHostAddresses("www.google.com")[0] | Select IPAddressToString -ExpandProperty IPAddressToString | Out-File c:folderfilename.txt

This will lookup www.google.com and put the first returned IPv4 address into a file.

If you're using PowerShell v3+ on Windows 8+ (or Server 2012+) you can user the use the Resolve-DnsName cmdlet instead of the .Net GetHostAddress call. ie:

(Resolve-DnsName www.google.com)[0] | Select IPAddressToString -ExpandProperty IPAddressToString | Out-File c:folderfilename.txt

Simply change www.google.com to your preferred domain name. Or put it in a PowerShell script and set it up to accept an argument (of the domain name you want to look up).

More info on that: How to pass an argument to a PowerShell script?

Works good for me on my Linux machine. I've never tried it on other systems though but Google has a lot of articles on how to install dig for example on Windows

The only thing to note, for local hostnames search domain should be added explicitly.
So if you have myhost host in your local network with search domain mynetwork put

dig +short myhost.mynetwork

on command line.

Examples:

sergeyi@sergeyi:~$ dig +short google.ru

173.194.222.94



sergeyi@sergeyi:~$ dig A +short google.ru

173.194.222.94



sergeyi@sergeyi:~$ dig AAAA +short google.ru

2a00:1450:4010:c0b::5e

If your goal is to retrieve your external IP with a script, a possible would be the use of a very simple PowerShell function :

function Get-ExternalIP {

(Invoke-WebRequest ifconfig.me/ip).Content

}

Running this function will return your external IP, and no other useless information.

Source and examples : http://jfrmilner.wordpress.com/2012/12/22/powershell-quick-tip-03-whats-my-external-ip-address-windows-command-line/

Alternatively, if you want to be able to get the IP resolution for other hosts, you should have a look at the Resolve-DnsName cmdlet. Unfortunatelly, your computer must be running Windows 8.1 or Windows Server 2012 R2 in order to use this cmdlet. Here is an example I just performed :

Hope this helps !

Simple.

In nslookup use:

Set type=A

Then lookup. The set command will show only outputs for A records. You can use this for MX, CNAME, AAA etc.

Not ideal, but I sometimes use this method:

ping -c 1 myip.opendns.com | grep -ohE "(([0-9]+.[0-9]+.[0-9]+.[0-9]+))" | head -1 | sed "s/[()]//g"

Using PowerShell, you can run below:

(((nslookup myip.opendns.com resolver1.opendns.com 2>null| select-string -pattern "Address:") -split ":")[3]).Trim()