Create a file in Notepad called “LookupFQDN.cmd” and put the following contents inside:
@for /f %%I in (Hostnames.txt) do ping -n 1 %%I >> Results.txt
@find “Pinging” Results.txt > Output.txt
@for /f “eol=- tokens=2,3 delims= ” %%I in (Output.txt) do echo %%J >> Results.txt
Put the file “Hostnames.txt” in the same directory where this CMD file is located, and run the LookupFQDN script. It should process each line in the “Hostnames.txt” file and spit out a file “Results.txt” that will contain the IP addresses for all of the entered FQDN names.
You might have to remove the brackets  in front of and behind the IP addresses.