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An easy way to do this is amending the registry, you can change or remove the DNS Suffixes from here:

HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient

Open RegEdit and navigate to HKLM\SOFTWARE\Policies\Microsoft\Windows
NT\DNSClient
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
GPUPDATE /FORCE