Appendix A. Acknowledgments

The authors would like to offer a special note of thanks to APNIC, which nominated 198.51.100.0/24 and 203.0.113.0/24 for this purpose. The authors would also like to acknowledge that this document inherits material from [RFC3849].

The authors would also like to thank Geoff Huston, Peter Koch, Ulf Olsson, John Klensin, and others for interesting discussions of this topic.