What rDNS naming convention should I use?
You will facilitate life to other people by using a fixed string like dynamic or dialup as a subdomain immediately below your domain, putting the geographical information (if it applies to your case) at the next level, andthe most variable information (like the last octet of the IP) at the outer level. Try to use dots as separators rather than dashes or other symbols, so as to create subdomains, and try to put the variable information on the leftmost part of the name.
