This property returns a string which is either a two- or
three-letter code which identifies a geopolitical subdivision within
the country where the external IP address is located. These codes are
defined by the ISO 3166-2 standard. For example, the code for the
state of California in the United States is "CA".
For international specificity, these subdivision codes are often
combined with the value of the ISO alpha-2 code returned by the
CountryAlpha property. For example, to identify the state
of California, you could combine with the alpha-2 code for the
United States, creating "US-CA" as an identifier.
If a subdivision code does not exist for the location, this
property will return an empty string.