Usually, the Exchange external Autodiscover DNS entity is configured as a regular A or CNAME record. In some cases, a service record (SRV) is used instead. Here is a simple syntax of quickly querying for the SRV record:

nslookup -q=srv

In this example, I “ask” Google’s Public DNS ( to “show” me what it knows about Autodiscover record in  “” domain. Here is a result:

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