Example of allocating and ِassignment of an IPv4 address space according to the allocation hierarchy.
Kevin R.Fall; W.Richard Stevens (2012)    (in English)   TCP/IP Illustrated Volume 1 (2nd ed.), Pearson Education, Inc., p. 63−64. Archived from the original on 20 November 2017. Retrieved on 14 February 2020. ISBN:  0321336313.
Michel Bakni