Hey,
i got some questions about this issue... so
if you use a dynamic ip you can got an static hostname by dyndns.org ...

if you register an project and you specify a hostname then be sure that
you give the ip of your host into the token...

token = md5 ( outputType + IP adress + partnerid + secure token )

you get your own ip by using for example this command line from your scripts
on windows ipconfig /all
or
on linux /sbin/ifconfig

some script languages has defined standard functions to get the ip from your server.

for example, php can get an ip by an hostname by the function

echo gethostbyname('spaceinvasion.info');

http://php.net/gethostbyname

I hope i can clear some questions

best regards
Dschibait