We moved the servers to a new host and now have a new IP. @Gatherix registered the servers with steam a while back, so if my understanding of the favorites migration is correct, your favorites should sync with the new IP within the next 24 hours. Until then you can find the servers in the browser, or you can simply get the IPs from here and update your favorites manually.
The DARKLY Trade servers can now be found at:
DARKLY Trade/Idle #1 - 126.96.36.199:27017 - Join -
DARKLY Trade/Idle #2 - 188.8.131.52:27018 - Join -
DARKLY Trade/Idle #3 - 184.108.40.206:27019 - Join -
The servers below are not currently active, though they may be used for Events and the like.