Getting the Central Admin URL for a Farm in SharePoint

I recently needed to get the Url of the CA for a SharePoint farm, after a bit of hunting in the API it was tracked down under the SPAdministrationWebApplication object.

C#

SPAdministrationWebApplication caWebApp = Microsoft.SharePoint.Administration.SPAdministrationWebApplication.Local;
var url = caWebApp.Sites[0].Url;

PowerShell

$caWebApp = [Microsoft.SharePoint.Administration.SPAdministrationWebApplication]::Local
$caWebApp.Sites[0].Url