[1] Cooper, A., and J. Postel, "The US Domain", RFC 1480, USC/Information Sciences Institute, June 1993.
[2] Reynolds, J., and J. Postel, "Assigned Numbers", STD 2, RFC 1340, USC/Information Sciences Institute, July 1992.
[3] Mockapetris, P., "Domain Names - Concepts and Facilities", STD 13, RFC 1034, USC/Information Sciences Institute, November 1987.
[4] Mockapetris, P., "Domain Names - Implementation and Specification", STD 13, RFC 1035, USC/Information Sciences Institute, November 1987.
[6] Partridge, C., "Mail Routing and the Domain System", STD 14, RFC 974, CSNET CIC BBN, January 1986.
[7] Braden, R., Editor, "Requirements for Internet Hosts -- Application and Support", STD 3, RFC 1123, Internet Engineering Task Force, October 1989.
