What is a second-level domain (SLD)?
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A second-level domain (SLD) is the portion of the domain name that is located immediately to the left of the dot and domain name extension. Example 1: The SLD in coolexample.com is coolexample. Example 2: The SLD in coolexample.co.uk is still coolexample.
You define the SLD when you register a domain name.
You can use more than one SLD with the same IP address.