Document functionality of unclear DynDNS providers
The pages  and  would benefit from improved documentation of certain DynDNS providers. For example, there are three categories of HE.net DynDNS types to choose from yet no guidance of how to choose the right one for the job.
A user turning to HE.net for documentation finds that they must create two separate accounts (one for Tunnelbroker and another for DNS service) learn about HTTP POST, which tunnel id or username to use, where to place it in the POST URL, which URI format to use, how to mark a DNS master host as 'dynamic', if this is possible with DNS slave zones, and so on.
We don't need comprehensive documentation, but a few short 3-4 sentence paragraphs for the three HE.net DynDNS types would help a lot.