Determine Org Type via Apex

CallingClass.cls

' Controller/Trigger calling:

system.debug(' o ' + Utility.isSandbox());

' If Statement Example
If(Utility.isSandbox())
{
' Run this code, as current enviroment is a sandbox  
}

Utility.cls

public class Utility {
  
  public static Boolean sandboxBool; 
  
  public static Boolean isSandbox() 
  {
      if ( sandboxBool == null ) sandboxBool = URL.getSalesforceBaseUrl().getHost().left(2).equalsignorecase('cs');
      return sandboxBool;
  }
  
}