1. Huston, G.: IPv4 Address Report (May 21, 2008), http://www.potaroo.net/tools/ipv4/
2. Hain, T.: A Pragmatic Report on IPv4 Address Space Consumption. The Internet Protocol Journal 8(3) (September 2005)
3. Huston, G., Kosters, M.: Update on Resource Certification. CIDR Report (March 2008)
4. Evans, K.: OMB Memorandum M-05-22 (August 2, 2005)
5. Federal Government Transition IP Version 4 to IP Version 6 – Frequent Asked Questions (February 15, 2006)