Second Level Domains

The second level Domain is  (SLD) is the part of an URL that identifies the specific and unique administrative owner associated with an Internet Protocol address (IP address). The second-level domain name includes the top-level domain (top-level domain) name.

second level domain

For example, in servermx.com, “servemx” is a second-level domain and  “servermx.com” is a second-level domain name (and includes the top-level domain name of “com”).