noip.com offers three DNS names with free accounts.
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Install and configure the client
https://www.noip.com/support/knowledgebase/installing-the-linux-dynamic-update-client/
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Create systemd server
/etc/systemd/system/noip2.service
with the following content[Unit] Description=noip2 service [Service] Type=forking ExecStart=/usr/local/bin/noip2 Restart=always [Install] WantedBy=default.target
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Enable the service
sudo systemctl enable noip2.service
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Start the service
sudo systemctl start noip2.service