A free DNS service

[Teddy]

need help whit A free DNS service
i find 1 https://www.dyndns.com
but when i have type my ip addres and find a addres like
***.mine.nu its work but when i try to go in to the site
this come

Address Not Found



Firefox can't find the server at sweddy.mine.nu.


The browser could not find the host server for the provided address.

* Did you make a mistake when typing the domain? (e.g. "ww.mozilla.org" instead of "www.mozilla.org")
* Are you certain this domain address exists? Its registration may have expired.
* Are you unable to browse other sites? Check your network connection and DNS server settings.
* Is your computer or network protected by a firewall or proxy? Incorrect settings can interfere with Web browsing.