What is this greyed out local subfolder in dns? Can it be removed?

Just cleaning out my DNS and I see this greyed out local subfolder. It has a NS record that shows an old DC that has not been in use for awhile. Is it safe to delete?
Please see picture.

Thank you.
dns_greyed_out_folder.PNG
rivkamakAsked:
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Tom CieslikIT EngineerCommented:
A gray folder usually means a delegation, or error, If you have no error in DNS then all is OK
It can't be removed
RobertSystem AdminCommented:
That is a delegation.
Someone created it in your zone as it isn't there by default.

As for if you can delete it that depends on if it is needed. If you didn't create it someone on your team may have and may know if it is needed for an actual delegation.
Tom CieslikIT EngineerCommented:
Delegation are created by system, Let say if you have Exchange server and You did configured autodiscover in your IIS and bind it to port 443 then you'll have autodiscover grayed out in your local DNS and you can;t remove it, because if you do, your DNS will not reply correctly to new Outlook version request and You'll not connect client to Exchange.
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rivkamakAuthor Commented:
Thank you. This particular delegation has an old NS record (the dc was made and taken off many years ago). I also see the NS record in the same place as all the current NS records. Any harm in deleting this old NS record from dns?
Tom CieslikIT EngineerCommented:
If is OLD and you are not using anymore then yes, you can delete it

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RobertSystem AdminCommented:
No no harm in removing old NS records in fact if you run a dcdiag with dns flag it would probably indicate that the invalid NS a problem.
DrDave242Senior Support EngineerCommented:
As has already been said, a gray folder in the DNS console represents a delegation. It'll only contain NS records, which correspond to servers that (should) host the zone represented by the delegation. In your case, the delegation represents a zone named local.domain.local. Given that, I have a hunch that the delegation was created by mistake by someone who was attempting to do something else. Since the server in its only NS record is no longer in use, the delegation isn't serving any real purpose at all and should be deleted.
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