Getting the local machine's IP Address

If you haven't seen this before, that's okay because I hadn't either:

[System.Net.Dns]::GetHostbyAddress($IP).HostName

The problem I have with this call is that it is mentally deprived. First, how can this be called without already knowing the IP address? It can't meaning, you already have a method to obtain the IP Address.  Why would you want to bother getting the HostName?

[System.Net.Dns]::GetHostbyName("WIN-SEN3DGN4RRM").HostName

This returns my FQDN:   WIN-SEN3DGN4RRM.Mary.Local

Same call but with a different property:

[System.Net.Dns]::GetHostbyName("WIN-SEN3DGN4RRM").AddressList[0].IPAddressToString

Returns: 10.1.10.14