RFC-953, Network Information Center, SRI International, October
      1985.

   3. Kudlick, M. "Host Names Online", RFC-608, Network Information
      Center, SRI International, January 1973.

   4. Postel, J., "Internet Protocol", RFC-791, Information Sciences
      Institute, University of Southern California, Marina del Rey,
      September 1981.

   5. Postel, J., "Address Mappings", RFC-796, Information Sciences
      Institute, University of Southern California, Marina del Rey,
      September 1981.

   6. Postel, J., "Domain Name System Implementation Schedule", RFC-921,
      Information Sciences Institute, University of Southern California,
      Marina del Rey, October 1984.

   7. Reynolds, J. and Postel, J., "Assigned Numbers", RFC-943,
      Information Sciences Institute, University of Southern California,
      Marina del Rey, April 1985.