How can I take over a registered nickname that has not been used in a long time?

Nicknames which are considered expired are automatically dropped after 60 days, allowing others to register them. Any other nicknames that are considered expired are not dropped on a regular basis, but rather when we notice them. If you ask a staff member in #help, we'll be happy to manually drop the one you want (provided it's expired) so that you can re-register it.

This FAQ entry's short URL is http://www.darenet.org/faq/24