RFC Status Reference Notes
3692 Best Common Practice T. Narten (January 2004). Assigning Experimental and Testing Numbers Considered Useful. Network Working Group. doi:10.17487/RFC3692. BCP 82. RFC 3692. Updates RFC 2434.
3696 Informational J. Klensin (February 2004). Application Techniques for Checking and Transformation of Names. Network Working Group. doi:10.17487/RFC3696. RFC 3696.