There are lots of examples of this type of "squat space" being used for largely internal addressing in addition to rfc 1918 space: https://teamarin.net/2015/11

There are lots of examples of this type of "squat space" being used for largely internal addressing in addition to rfc 1918 space: https://teamarin.net/2015/11/23/to-squat-or-not-to-squat/ https://teamarin.net/2015/11/23/to-squat-or-not-to-squat/