An easy way to do this is amending the registry, you can change or remove the DNS Suffixes from here:
Open RegEdit and navigate to HKLM\SOFTWARE\Policies\Microsoft\Windows
Edit SearchList by appending a comma plus your four.domain.com to the
entry, then close RegEdit.
Now at an elevated command prompt type “IPCONFIG /REGISTERDNS“
You should now see your new entry when you type “IPCONFIG /ALL“
This will last until Group Policy is refreshed.
To make the entry disappear after testing, open a cmd prompt and type